PHY102 Week 5 | Computational Physics in Physics - Grand canyon university
Week 5
assignment
Wave, Sound, and Light Exercises PHY-102: Wave, Sound, and Light Exercises Complete the following exercises.
1. What is
the source of all waves?
2. A water
wave vibrates up and down four times each second, the distance between two successive crests is 5 meters, and the height from the lowest part to the highest part of the wave is 2 meters. a. What is the frequency of the wave in hertz? b. What is the period of the wave in seconds? c. What is the speed of the wave in meters per seconds? d. What is the amplitude of the wave in meters?
3. When you
sit in the stands at a baseball stadium, you will hear the crack of the bat a short time after you see the batter hit the ball. Explain.
4. Why is
the moon sometimes described as silent?
5. You are
hiking in a canyon and you notice an echo. You decide to let put a yell and notice it took 2 seconds before you heard the echo of your yell. How far away is the canyon wall that reflected your yell?
6. Explain
how the Doppler effect is used by the police to measure the speed of a car.
7. The light
from the sun has higher frequencies from one side of the sun than from the other side. What does that tell you about the sun?
8. What is
the source of all electromagnetic waves?
9. Why is
the lettering on the front of an ambulance “backwards” (see figure below)?
10. What do
radio waves, microwaves, light, and x-rays have in common?
11. Rank the
following electromagnetic waves in order of increasing frequency.
A. Microwaves
B. Radio
waves
C. Ultraviolet
radiation
D. Visible
light
E. X-rays
F. Infrared
radiation
12. During a
lunar eclipse the moon is in the shadow of the Earth. Why does the moon have a faint red color during the eclipse?
13. The
distance from the sun to the Earth is 1.5 x 1011 m. How long does it take for light from the sun to reach the earth? Give your answer in seconds.
14. Why are
polarized sunglasses particularly effective in reducing glare?
15. Match the
following colored objects with the way in which the colors are produced.
1) Red rose
2) Rainbow
3) Oil film
4) Peacock
feather
5) Blue sky
A. Scattering
B. Refraction
C. Diffraction
D. Interference
E. Selective
reflection
The remaining questions are multiple-choice questions:
16. If the
frequency of a vibration is doubled, what happens to the period?
A. The
period is doubled.
B. The
period remains the same.
C. The
period is reduced to one-quarter.
D. The
period is reduced to one-half
E. The
period is quadrupled.
17. What is
the distance between two successive crests on a transverse wave called?
A. Wavelength
B. Period
C. Amplitude
D. Frequency
E. Compression
18. Noise-cancelling
earphones use which of the following phenomena?
A. Frequency
B. Constructive
interference
C. Destructive
interference
D. Resonance
E. Beats
19. If the sun
were to suddenly "turn off’, we would not know about it for about 8 minutes. Why?
A. It would
take about 8 minutes to realize what happened because of the darkness.
B. It takes
about 8 minutes for the sun to "power down".
C. It takes
about 8 minutes for Earth to spin around so we can see the sun.
D. It takes
about 8 minutes for the light to travel from the sun to Earth.
20. If the
atmosphere was much thicker than it is now, how would the sun appear?
A. The sun
would appear the same.
B. The sun
would appear blue-violet.
C. The sun
would appear green-blue.
D. The sun
would appear red-orange.
E. The sun
would appear yellow-green.
21. If you dip
your finger in a tub of water at a constant rate, concentric circular waves with a constant spacing (wavelength) will form. If you double the frequency at which you dip your finger, what will happen to the wavelength?
A. The
wavelength is reduced to one-quarter.
B. The
wavelength is reduced to one-half.
C. The
wavelength is quadrupled.
D. The
wavelength is doubled.
E. The
wavelength remains the same.
22. If you
hear the clap of a thunder 5 seconds after seeing the flash of lightning, how far away from you did the lightning strike?
A. About 5
miles
B. About 5
kilometers
C. About 1
mile
D. About 1
kilometer
23. What are
the three paint colors used for color subtraction?
A. Red,
yellow, and blue
B. Red,
green, and blue
C. Orange,
purple, and green
D. Magenta,
green, and yellow
E. Magenta,
cyan, and yellow
24. If you
shine a beam of red light and a beam of green light on the same area of a screen, what color will you see on the screen?
A. Red
B. Green
C. White
D. Yellow
E. Cyan
F. Magenta
25. If you mix
equal amounts of cyan pigments and magenta pigments on a sheet of white paper, what color will you see on the paper?