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Wednesday, September 2, 2015

SAT Physics Real Test from Official Study Guide pdf download

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SAT Subject Physics Practice Test from Officical Study Guide
This SAT subject physics practice test is from SAT Subject Physics Official Study Guide.

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Saturday, August 29, 2015

SAT Physics Practice Test: Waves

1. What is the wavelength of a 5 Hz wave that travels with a speed of 10 m/s?
(A) 0.25m
(B) O.5m
(C) 1m
(D) 2m
(E) 50m

2. A rope of length 5 m is stretched to a tension of 80 N. If its mass is 1 kg, at what speed would a 10 Hz transverse wave travel down die string?

(A) 2 m/s
(B) 5 m/s
(C) 20 m/s
(D) 50 m/s
(E) 200m/s

3. A transverse wave on a long horizontal rope with a wavelength of 8 m travels at 2 m/s. At t = 0, a particular point on the rope has a vertical displacement of +A, where A is the amplitude of the wave. At what time will the vertical displacement of this same point on the rope be -A?

(A) t = 1/8 s
(B) t = 1/4 s
(C) t = 1/2s
(D) t = 2 s
(E) t = 4s

4. What is the wavelength of a wave with period 2s and speed 2 cm/s?

(A) 0.25 cm
(B) 0.5 cm
(C) 1 cm
(D) 2 cm
(E) 4 cm

5. A string, fixed at both ends, supports a standing wave with a total of 4 nodes. If the length of the string is 6 m, what is the wavelength of the wave?

(A) 0.67 m
(B) 1.2 m
(C) 1.5 m
(D) 3 m
(E) 4 m

6. A string, fixed at both ends, has a length of 6 m and supports a standing wave with a total of 4 nodes. If a transverse wave can travel at 40 m/s down the rope, what is the frequency of this standing wave?

(A) 6.7 Hz
(B) 10.0 Hz
(C) 13.3 Hz
(D) 20.0 Hz
(E) 26.7 Hz

7. A sound wave travels through a metal rod with wavelength λ and frequency ƒ. Which of the following best describes the wave when it passes into the surrounding air?

Wavelength Freaueoey
(A) Less than λ Equal to ƒ
(B) Less than λ Less than ƒ
(C) Greater than λ Equal to ƒ
(D) Greater than λ Less than ƒ
(E) Greater than λ Greater than ƒ

8. In the figure below, two speakers, S₁, and S₂, emit sound waves of wavelength 2 m, in phase with each other.

Let A_P be the amplitude of the resulting wave at point P, and A_Q the amplitude of the resultant wave at point Q. How does A_P compare to A_Q?

(A) A_P < A_Q
(B) A_P = A_Q
(C) A_P > A_Q
(D) A_P < 0, A_Q > 0
(E) A_P and A_Q vary with time, so no comparison can be made.

9. An observe mice of sound waves.

By how much will the sound level decrease if the observer moves to a distance of 20 m ?

(A) 1dB
(B) 2dB
(C) 10 dB
(D) 18 dB
(E) 20 dB

10. An organ pipe that’s closed at one end has a length of 17 cm. If the speed of sound through the air inside is 340 m/s, what is the pipe’s fundamental frequency?

(A) 250 Hz
(B) 500 Hz
(C) 1,000 Hz
(D) 1,500 Hz
(E) 2,000 Hz

11. A bat emits a 40 kHz “chirp” with a wavelength of 8.75 mm toward a tree and receives an echo 0.4 s later. How far is the bat from the tree?

(A) 35 m
(B) 70 m
(Q 105 m
(D) 140 m
(E) 175 m

12. A car is traveling at 20 m/s away from a stationary observer. If the car’s horn emits a frequency of 600 Hz, what frequency will the observer hear? (Use v = 340 m/s for the speed of sound.)

(A) (34/36X600 Hz)
(B) (34/32X600 Hz)
(C) (36/34X600 Hz)
(D) (32/34X600 Hz)
(E) (32/36X600 Hz)

SAT Physics Practice Tests

SAT Physics Subject Test Pdf Download

SAT Physics Practice Test: Optics

1. What is the wavelength of an X-ray whose frequency is 1.0 x 10¹⁸Hz?

(A) 3.3 x 10^-11 m
(B) 3.0 x 10^-10 m
(C) 3.3 x lQ^-9 m
(D) 3.0 x 10^-8 m
(E) 3.0 x lO²⁶ m

2. In Young’s double-slit interference experiment, what is the difference in path length of the light waves from the two slits at the center of the first bright fringe above the central maximum?

(A) 0
(B) λ/4
(C) λ/2
(D) λ
(E) 3λ/2

3. A beam of light in air is incident upon the smooth surface of a piece of flint glass, as shown

If the reflected beam and refracted beam are perpendicular to each other, what is the index of refraction of the glass?

(A) 1/2
(B) 0.5√3
(C) √3
(D) 2
(E) 2√3

4, When green light (wavelength = 500 nm in air) travels through diamond (refractive index = 2.4), what is its wavelength?

(A) 208 nm
(B) 357 nm
(C) 500 nm
(D) 700 nm
(E) 1,200 nm

5. A beam of light traveling in medium 1 strikes the interface to another transparent medium, medium 2. If the speed of light is less in medium 2 than in medium 1, the beam will

(A) refract toward the normal
(B) refract away from the normal
(C) undergo total internal reflection
(D) have an angle of reflection smaller than the angle of incidence
(E) have an angle of reflection greater than the angle of incidence

6. If a clear liquid has a refractive index of 1.45 and a transparent solid has an index of 2.90 then, for total internal reflection to occur at the interface between these two media, which of the fallowing must be true?

at an angle
incident beam 　　　　of incidence
originates in　　　　　greater than

(A) the solid　　　　　30°
(B) the liquid　　　　　30°
(C) the solid 　　　　　60°
(D) the liquid　　　　　60°
(E) Total internal reflection cannot occur.

7. An object is placed 60 cm in front of a concave spherical mirror whose focal length is 40 cm. Which of the following best describes the image?

Nature of imaee　　 Distance from mirror
(A) Virtual　　　　 24 cm
(B) Real　　　　　　24 cm
(C) Virtual 　　　　120 cm
(D) Real　　　　　　120 cm
(E) Real　　　　　　240 cm

8. An object is placed 60 cm from a spherical convex mirror. If the mirror forms a virtual image 20 cm from the mirror, what’s the magnitude of the mirror’s radius of curvature?

(A) 7.5 cm
(B) 15 cm
(C) 30 cm
(D) 60 cm
(E) 120 cm

9. The image created by a converging lens is projected onto a screen that’s 60 cm from the lens. If the height of the image is 1/4 the height of the object,
what’s the focal length of the lens?

(A) 36 cm
(B) 45 cm
(C) 48 cm
(D) 72 cm
(E) 80 cm

10. Which of the following is true concerning a biconcave lens?

(A) Its focal length is positive.
(B) It cannot form real images.
(C) It cannot form virtual images.
(D) It can magnify objects.
(E) None of the above

SAT Physics Practice Test: Modern Physics

1. What’s the energy of a photon whose wavelength is 2.07 nm ?

(A) 60 eV
(B) 600 eV
(C) 960 eV
(D) 6,000 eV
(E) 9,600 eV

2. A metal whose work function is 6.0 eV is struck with light of frequency 7.2 x 10¹⁵ Hz. What is the maximum kinetic energy of photoelectrons ejected from the metal’s surface?

(A) 7 eV
(B) 13 eV
(C) 19 eV
(D) 24 eV
(E) No photoelectrons will be produced.

3. An atom with one electron has an ionization energy of 25 eV. How much energy will be released when the electron makes the transition from an excited energy level, where E= -16 eV, to the ground state?

(A) 9eV
(B) 11 eV
(C) 16 eV
(D) 25 eV
(E) 41 eV

4. The single electron in an atom has an energy of -40 eV when it’s in the ground state, and the first excited state for the electron is at -10 eV. What will happen to this electron if the atom is struck by a stream of photons, each of energy 15 eV ?

(A) The electron will absorb the energy of one photon and become excited halfway to the first excited state, then quickly return to the ground state, without emitting a photon.
(B) The electron will absorb the energy of one photon and become excited halfway to the first excited state, then quickly return to the ground state, emitting a 15 eV photon in the process.
(C) The electron will absorb the energy of one photon and become excited halfway to the first excited state, then quickly absorb the energy of another photon to reach the fast excited state.
(D) The electron will absorb two photons and be excited to the first excited state.
(E) Nothing will happen

5. What isthede Broglie wavelength of a proton whose linear momentum has a magnitude of 3.3 x 10^-23 kg·m/s ?

(A) 0.0002 nm
(B) 0.002 nm
(C) 0.02 nm
(D) 0.2 nm
(E) 2nm

6. The difference between the mass of an intact phosphorus-31 nucleus and the sum of the masses of its individual protons and neutrons is 0.2825 u. What is the nuclear binding energy per nucleon?

(A) 4.6 MeV/nucleon
(B) 6.3 MeV/nucleon
(C) 8.5 MeV/nucleon
(D) 12.1 MeV/nucleon
(E) 17.4 MeV/nucleon

7. Compared to the parent nucleus, the daughter of a β-decay has

(A) the same mass number but a greater atomic number
(B) the same mass number but a smaller atomic number
(C) a smaller mass number but the same atomic number
(D) a greater mass number but the same atomic number
(E) None of the above

8. The reaction

is an example of what type of radioactive decay?

(A) alpha
(B) β^-
(C) β⁺
(D) electron capture
(E) gamma

9. Tungsten-176 has a half-life of 2.5 hours. After how many hours will the disintegration rate of a tungsten-176 sample drop to its initial value?

(A) 5
(B) 8.3
(C) 10
(D) 12.5
(E) 25

10. What’s the missing particle in the following nuclear reaction?

(A) Proton
(B) Neutron
(C) Electron
(D) Positron
(E) Deuteron

11. What’s the missing particle in the following nuclear reaction?

(A) Proton
(B) Neutron
(C) Electron
(D) Positron
(E) Gamma

12. Two spaceships are traveling directly toward each other, one traveling at a speed of g and the other c/6 at a speed of c/3, as measured by observers on a nearby planet Hie faster ship emits a radar pulse directed toward the approaching ship. What is the speed of this radar pulse, as measured by observers on the planet?

(A) c/2
(B) 5c/6
(C) c
(D) 7c/6
(E) 3c/2

13. An Imperial battle cruiser, sitting in a hanger deck, is measured to have a length of 200 m by a worker on the deck. If the cruiser travels at a speed of (0.5*√3)c past a planet, what will be the length of the cruiser, as measured by the inhabitants of the planet?

(A) 50 m
(B) 87 m
(C) 100 m
(D) 173 m
(E) 400 m

14. An astronaut lives on a spaceship that is moving at a speed of 4c/5 away from the earth. As measured by a clock on the spaceship, the time interval between her maintenance checks on the ship’s main computer is 15 months. In the reference frame of the team here on Earth that monitors the ship’s progress, what is the time interval between maintenance checks on the ship’s main computer?

(A) 9 months
(B) 12 months
(C) 19 months
(D) 25 months
(E) 30 months

15. A particle whose rest energy is E is traveling at a speed of 12c/13. What is the particle’s kinetic energy?

(A) 7E/169
(B) 5E/13
(C) 3E/5
(D) 8E/5
(E) 13E/5

Sunday, May 25, 2014

SAT Physics Work, Energy, Power, Momentum, Conservation Laws

1. An object moves 25m with a constant speed v, as shown in the figure below while a force F = 20N is exerted on the object. What is the work done by the force F?

a) -500J
b) -250J
c) 0J
d) 250J
e) 500J
2. The graph above plots the force exerted on a block of mass m against the displacement of the block. What is the work done by the force in moving the box from d = 0 to d = 6?

a) 2J
b) 5J
c) 8J
d) 10J
e) 15J
3. Two forces push simultaneously a stationary 2kg box in opposite directions: F1 acts from left to right and does 150J of work on the box while F2 acts from right to left and does 50J of work on the box. What is the velocity of the box after the work has been done on it?
a) 5m/s
b) 7m/s
c) 10m/s
d) 12m/s
e) 15m/s
4. A soccer ball is kicked vertically from the ground level with a speed of 20m/s. At what height is the gravitational potential energy of the ball maximum?
a) 5m
b) 10m
c) 15m
d) 20m
e) 25m
5. Two billiard balls move on a frictionless surface with speeds v and v/2, as shown in the figure below. Both of these balls have the same mass, and the collision is perfectly elastic. What is the sum of the velocities of the two balls after the collision?

a) v/2
b) v
c) 3v/2
d) 2v
e) 5v/2
6. A shopping cart weighing 12kg moves with a speed of 5m/s. A 3kg food container falls in the shopping cart. What is the speed of the shopping cart after the container fall?
a) 1m/s
b) 2m/s
c) 3m/s
d) 4m/s
e) 5m/s

Solutions:
Question #1: b
Question #2: d
Question #3: c
Question #4: d
Question #5: c
Question #6: d

SAT Physics Dynamics Practice Test

1. A particle is moving with a constant velocity, v. One or two forces are applied to the particle, as shown in the figures below. In which of the cases below, the forces applied do not change the speed of the particle?

2. An object of mass m = 20kg is pushed by four forces: east by a 10N force, west by a 30N force, south by a 20N force and north by a 20N force, What is the magnitude of the acceleration of the object?
a) .5m/s²
b) 1m/s²
c) 2m/s²
d) 10m/s²
e) 15m/s²
3. Two forces F₁ and F₂ act on a block of mass m = 5kg, as shown in the figure below. What is the acceleration of the block if the friction between the surface and the block is negligible?

a) .5m/s²
b) 1m/s²
c) 2m/s²
d) 5m/s²
e) 10m/s²
4. Two forces F₁ and F₂ act on a particle as shown in the figure below. What is the orientation of the acceleration of the particle?

a) same orientation as F₁
b) same orientation as F₂
c) same orientation as the x axis
d) same orientation as the y axis
e) same orientation as the negative -x axis
5. In the figure below, F = 10N, the mass of the block is m = 2kg and the block decelerates with 5m/s². What is the coefficient of kinetic friction between the block shown below and the surface of contact?

a) .1
b) .22
c) .33
d) .45
e) .6
6. Two blocks of masses m1 and m2 sit on the same surface. Equal forces, F₁ = F₂ = F are applied to the blocks, F₁ to the block of mass m₁ and F₂ to the block of mass m₂. If block m1 does not move and block m2 is accelerating, and the coefficients of static friction are μ_s1 and μ_s2, select the inequality that must be correct:
a) μ_s1m₁g ≤ F ≤ μ_s2m₂g
b) μ_s2m₂g ≤ F ≤ μ_s1m₁g
c) μ_s1m₁g ≤ F ≤ μ_s2m₂g
d) μ_s2m₂g ≤ F ≤ μ_s1m₁g
e) μ_s1m₁ ≤ F ≤ μ_s2m₂
7. A block of mass m = 5kg slides down the inclined plane from the figure below. If the coefficient of dynamic friction is .5, what is the acceleration of the block?

a) .375m/s²
b) .5m/s²
c) .525m/s²
d) .675m/s²
e) .75m/s²
8. Two blocks of masses m and M slide to the left with a constant speed v as show in the figure below. Which of the following relations must be true? The pulley system is frictionless.

a) M·cosα = m·cosβ
b) M·sinα = m·sinβ
c) M·cosβ = m·cosα
d) M = m
e) M·sinβ = m·sinα
9. The figure below represents a pulley system where masses m = 5kg and M = 10kg are connected by a rope over a massless and frictionless pulley. If the system moves with an acceleration of 1m/s², what is the value of the coefficient of kinetic friction between the block of mass M and table?

a) .2
b) .35
c) .45
d) .5
e) .75
10. An object of mass 4kg is attached to a spring. The equilibrium position of the object is .4m from the point where the spring exerts no force on the object. What is the spring constant, k?

a) 20N/m
b) 25N/m
c) 45N/m
d) 50N/m
e) 100N/m

Solutions:
Question #1: d
Question #2: b
Question #3: d
Question #4: d
Question #5: c
Question #6: d
Question #7: d
Question #8: a
Question #9: b
Question #10: e

SAT Physics: Newton’s Laws Practice Test

1. Two point charges of charge +Q are placed as shown below. At what point will a negative charge experience a force toward the bottom of the page?

a) A
b) B
c) C
d) D
e) E
2. Four point charges are placed in the corners of a square, as shown in the figure below. If q_b = 10^-9C, q_c = -10^-9C and q_d = 10^-9C, and the magnitude of the electric forces on q_c is 0 N, which of the statements below is true?

a) q_c > 10^-9C
b) 0 < q_c < 10^-9C
c) q_c = 0C
d) -10^-9C < q_c < 0C
e) q_c < -10^-9C
3. The magnitude of the electric field generated by a charge q at a distance d1 from the charge is E1. What is the magnitude of the electric field generated by the charge at a distance d2 from the charge?
a) E1
b) E1·(d₂²/d₁²)
c) E1·(d₁²/d₂²)
d) E1·(d₁/d₂))
e) E1·(d₂/d₁))
4. What is the capacitance between the points A and B if C₁ = C₂ = C₃ = 10^-6F?

5. A DC voltage source is connected to two resistors in series, as shown in the figure below. What is the ratio between the power dissipation of resistor R₁ and the power dissipation of resistor R₂?

6. A copper wire of length l₁ = 6 m and cross-sectional area of A₁ = 4 mm² has the same resistance as another copper wire of length l₂ = 18m. What is the ratio between the masses of the two wires, m₂/m₁?
a) 9
b) 3
c) 1
d) 1/9
e) 1/3
7. A particle with a positive charge of q moves with a speed v and passes through a magnetic field B parallel with the speed v. What is the magnitude of the magnetic force on the particle?

a) F = qvB
b) F = -qvB
c) F = 0
d) F = qvB/2
e) F = -qvB/2
8. In the figure below, a magnetic field of .01 T is applied locally to a wire carrying a current of intensity I = 10A. What is the magnitude of the magnetic force applied to the wire?

a) F = .3N
b) F = .4N
c) F = .5N
d) F = 1N
e) F = 3N
9. Three parallel long straight wires carry currents as shown in the picture below. If the currents in the wires #1 and #2 are I = 5A, and the magnetic force on wire #1 is equal to 0A, what is the current in wire #3?

a) I₃ = 5A
b) I₃ = 10A
c) I₃ = 15A
d) I₃ = 20A
e) I₃ = 25A
10. Two metallic bars slide along metallic rails at speeds v₁ = .1m/s and v₂ = .2m/s as shown below. The bar and the rails are situated in a magnetic field of 4T. What is the induced voltage in the bar and rails?

a) 50mV
b) 60mV
c) 100mV
d) 120mV
e) 150mV

Solutions:
Question #1: b
Question #2: e
Question #3: c
Question #4: c
Question #5: d
Question #6: a
Question #7: c
Question #8: b
Question #9: d
Question #10: d