PHY 102 Exam 4 LATEST UPDATE 2025 100%CORRECT
An electric motor is very similar to
A. an electric generator.
B. an automobile battery.
C. a radio receiver.
D. None of the above choices are correct. -(ANSWER) An electric generator
The amplitude of a particular wave is 1 meter. The top-to-bottom distance of the disturbance is -
(ANSWER) 2m
A transformer has 395 loops in the the primary coil and 245 loops in the secondary coil. If the
input current is 3.3 A, what is the output current of the transformer in Amps? -(ANSWER) 5.3
A 60-vibration-per-second wave travels 30 meters in 1 second. Its frequency is
A. 30 hertz and it travels at 60 m/s.
B. 60 hertz and it travels at 30 m/s.
C. 1800 hertz and it travels at 2 m/s.
D. 30 hertz and it travels at 30 m/s
E. 60 hertz and it travels at 60 m/s
Reset Selection -(ANSWER) 60 hertz and it travels at 30 m/s
During a single period, the distance traveled by a wave is
A. one-half wavelength.
B. one wavelength.
C. two wavelengths.
D. four wavelengths. -(ANSWER) one wavelength
If at a concert you run toward the orchestra, the frequency of the sound you hear will be
A. decreased.
B. increased.
C. neither decreased nor increased.
Reset Selection -(ANSWER) incresead
Which of the following is a property of light waves, but not of sound waves?
A. frequency
B. wavelength
C. amplitude
D. polarization
E. none of these -(ANSWER) polarization
If a visible light signal and a radio signal were emitted simultaneously from Alpha Centauri (a
distant star), the first to reach Earth would be the
A. radio signal.
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, B. visible light signal.
C. both would reach Earth at the same time. -(ANSWER) both would reach Earth at the same
time
Which of the following statements about the double-slit experiment is FALSE?
A. The bands of light are caused by the interference of the light coming from the two slits.
B. The results of the experiment show that light is a particle.
C. Double-slit interference patterns can be produced with sound and water waves.
D. The pattern on the screen consists of many bands of light, not just two bands. -(ANSWER)
The pattern on the screen consists of many bands of light, not just two bands.
When light reflects from a surface, there is a change in its
A. frequency.
B. wavelength.
C. speed.
D. all of these
E. none of these -(ANSWER) none of these
The technical name for the type of image formed by a single plane mirror is
A. a real image.
B. an inverted image.
C. an enlarged image.
D. a focal image.
E. a virtual image. -(ANSWER) a virtual image
As a light ray enters water from air at an angle of 15 degrees with respect to the normal, it
A. always bends toward the normal.
B. always bends away from the normal.
C. sometimes bends towards the normal.
D. sometimes bends away from the normal.
E. does not bend. -(ANSWER) always bend toward the normal
At night an underwater scuba diver aims his flashlight beam toward the surface at an angle of 15
degrees with the normal. Upon emerging, the beam angle with respect to the normal will be
A. less than 15 degrees.
B. 15 degrees.
C. more than 15 degrees.
D. impossible to predict. -(ANSWER) more than 15 degrees
When a light beam emerges from water into air, the average light speed
A. increases.
B. decreases.
C. remains the same. -(ANSWER) increases
What is the frequency of an electromagnetic wave that has a wavelength of 300,000 km?
A. less than 1 Hz
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An electric motor is very similar to
A. an electric generator.
B. an automobile battery.
C. a radio receiver.
D. None of the above choices are correct. -(ANSWER) An electric generator
The amplitude of a particular wave is 1 meter. The top-to-bottom distance of the disturbance is -
(ANSWER) 2m
A transformer has 395 loops in the the primary coil and 245 loops in the secondary coil. If the
input current is 3.3 A, what is the output current of the transformer in Amps? -(ANSWER) 5.3
A 60-vibration-per-second wave travels 30 meters in 1 second. Its frequency is
A. 30 hertz and it travels at 60 m/s.
B. 60 hertz and it travels at 30 m/s.
C. 1800 hertz and it travels at 2 m/s.
D. 30 hertz and it travels at 30 m/s
E. 60 hertz and it travels at 60 m/s
Reset Selection -(ANSWER) 60 hertz and it travels at 30 m/s
During a single period, the distance traveled by a wave is
A. one-half wavelength.
B. one wavelength.
C. two wavelengths.
D. four wavelengths. -(ANSWER) one wavelength
If at a concert you run toward the orchestra, the frequency of the sound you hear will be
A. decreased.
B. increased.
C. neither decreased nor increased.
Reset Selection -(ANSWER) incresead
Which of the following is a property of light waves, but not of sound waves?
A. frequency
B. wavelength
C. amplitude
D. polarization
E. none of these -(ANSWER) polarization
If a visible light signal and a radio signal were emitted simultaneously from Alpha Centauri (a
distant star), the first to reach Earth would be the
A. radio signal.
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, B. visible light signal.
C. both would reach Earth at the same time. -(ANSWER) both would reach Earth at the same
time
Which of the following statements about the double-slit experiment is FALSE?
A. The bands of light are caused by the interference of the light coming from the two slits.
B. The results of the experiment show that light is a particle.
C. Double-slit interference patterns can be produced with sound and water waves.
D. The pattern on the screen consists of many bands of light, not just two bands. -(ANSWER)
The pattern on the screen consists of many bands of light, not just two bands.
When light reflects from a surface, there is a change in its
A. frequency.
B. wavelength.
C. speed.
D. all of these
E. none of these -(ANSWER) none of these
The technical name for the type of image formed by a single plane mirror is
A. a real image.
B. an inverted image.
C. an enlarged image.
D. a focal image.
E. a virtual image. -(ANSWER) a virtual image
As a light ray enters water from air at an angle of 15 degrees with respect to the normal, it
A. always bends toward the normal.
B. always bends away from the normal.
C. sometimes bends towards the normal.
D. sometimes bends away from the normal.
E. does not bend. -(ANSWER) always bend toward the normal
At night an underwater scuba diver aims his flashlight beam toward the surface at an angle of 15
degrees with the normal. Upon emerging, the beam angle with respect to the normal will be
A. less than 15 degrees.
B. 15 degrees.
C. more than 15 degrees.
D. impossible to predict. -(ANSWER) more than 15 degrees
When a light beam emerges from water into air, the average light speed
A. increases.
B. decreases.
C. remains the same. -(ANSWER) increases
What is the frequency of an electromagnetic wave that has a wavelength of 300,000 km?
A. less than 1 Hz
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