Physics 101
World Wide Web Example Exam II
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1. Some minerals absorb ultraviolet light and then release lower energy visible light. This process is called
a) fluorescence.
b) atomic resonance.
c) incandescence.
d) phosphorescence.

2. In the dark at late evening, no color is seen because of lack of stimulation of
a. rods.
b. cones.
c. cornea.
d. crystalline lens.

3. Laser light is
a. chaotic.
b. incoherent.
c. coherent.
d. polychromatic.

4. Green light emitted by excited mercury vapor corresponds to a particular energy transition in the mercury atom. A more energetic transition might emit _____.
a. red light.
b. blue light.
c. either red or blue light
d. white light.

5. Rainbows are due to _____.
a. reflection from the surface of raindrops.
b. refraction and reflection by raindrops.
c. refraction through raindrops.
d. refraction and reflection by ice crystals.

6. Which of the following types of electromagnetic waves has the highest energy per photon?
a) radio waves
b) X-rays
c) infrared radiation.
d) microwaves.
e) ultraviolet light.

7. Which of the following is fundamentally different from the others?
a) X-rays.
b) sounds waves.
c) light waves.
d) radio waves.
e) gamma rays.

8. Materials generally become warm when light is
a) absorbed by them.
b) reflected by them.
c) transmitted by them.
d) all of these.

9. The shortest wavelength visible light of those below is
a) red.
b) blue.
c) green.
d) yellow.

10. Discrete spectral lines occur when excitation takes place in a
a) solid.
b) liquid.
c) gas.
d) superconductor.
e) all of these.

11. Dark lines in the Sun's spectrum represent light that is
a) absorbed by the Sun's atmosphere.
b) emitted by the Sun.
c) not emitted by the Sun.
d) in the ultraviolet region of the electromagnetic spectrum.

12. A photographer wishes to use a safety light in the darkroom that will emit low energy photons. The best visible color to use is
a) violet.
b) blue.
c) green.
d) red.
e) any of these.

13. The hottest star is the star that glows
a) red.
b) blue.
c) white.
d) yellow.
e) cannot be determined from color alone.

14. Some paints glow in the dark after the lights are turned off. This is because of
a) fluorescence.
b) resonance.
c) incandescence.
d) phosphorescence.

15. Because of atmospheric refraction the image of the sun rises _____ and sets _____ than the actual sun.
a. earlier ... earlier
b. earlier ... later
c. later ... later
d. later ... earlier

16. Light is emitted from atoms when
an electron is
a) boosted to a higher energy level.
b) makes a transition to a lower energy level.
c) in a circular orbit around the nucleus.
d) none of these.

17. Continuous spectra are observed for
a) stars.
b) a hot stove.
c) the helium tube.
e) cool gases around stars.

18. Green light emitted by excited mercury vapor corresponds to a particular energy transition in the mercury atom. A more energetic transition might emit
a) red light.
b) blue light.
c) white light.
d) yellow light.

19. The colored dots that make of the colors on a TV screen or computer monitor are
a) red, blue, and yellow.
b) red, blue, and green.
c) yellow, blue and green.
d) magenta, cyan, and yellow.
e) red, green and yellow.

20. Look at a full-color picture in a magazine with a magnifying glass and you'll see that the colored inks used are
a) red, blue, and yellow.
b) red, blue, and green.
c) yellow, blue and green.
d) magenta, cyan, and yellow.
e) red, green and yellow.

21. Suppose that two flashlight beams are shone on a white screen, one through a pane of blue glass and the other through a pane of green glass. What color appears on the screen where the two beams overlap?
a) yellow
b) green
c) cyan
d) magenta
e) red

22. Which of the following cannot be observed at the periphery of vision?
a) movement.
b) bright lights.
c) color.
d) shapes.

23. If a car headlight emitted only yellow light, the normally green grass appears to be
a) green.
b) red.
c) black.
d) white.
e) yellow.

24. To see an after image of a red, white and blue Texas flag one would first stare at a flag with the complimentary colors
a) yellow, violet, and green.
b) cyan, yellow, and magenta.
c) cyan, black, and yellow.
d) yellow, cyan and green.

25. The worst thing that you can do for the health of a green-leafed plant is to illuminate it with only
a) red light.
b) green light.
c) blue light.
d) all are equally bad.
e) none of these.

26. Different colors of light correspond to different light
a) speeds.
b) intensities.
c) wavelengths.
d) polarities.

27. Refraction of light when it travels from one medium to another results from difference in light's
a) frequency.
b) speed.
c) incident angles.
d) intensity.

28. Mirages are mainly caused by
a) refraction of light by the atmosphere.
b) reflection of light from water.
c) diffraction of light by air.
d) dispersion of light by the atmosphere.

29. The critical angle for an air and water interface is 48 degrees. If light is incident from the water on the air, it will be totally reflected if
a) if the angle of incidents is greater that 48 degrees.
b) the angle of incidence is 0 degrees, straight up.
c) if the angle of incidence is less that 48 degrees.
d) total internal reflection is not possible in this case.

30. When a fish looks up at the surface the horizon to horizon angle is
a) expanded to 196 degrees.
b) compressed to 96 degrees.
c) still 180 degrees.
d) compressed to 90 degrees.

31. The light reflected from your hand is an example of
a) Fermat's principle.
b) specular reflection.
c) dispersion.
d) diffuse reflection.

32. As you move forward toward a rainbow, the apparent height of the rainbow
a) increases.
b) decreases.
c) stays the same.

33. A beam of light passing through a prism has its colors spread out. The phenomenon is know as
a) reflection.
b) refraction.
c) dispersion.
d) diffraction.