Chapter 16

Light with a wavelength of 500 nm (5. 10-7 m) is incident upon a double slit with a separation of 0.17 mm (1.70 10-4 m). A screen is located 1.8 m from the double slit. At what distance from the center of the screen will the first bright fringe beyond the center fringe appear?

5.29 mm

What is the frequency of yellow light wave with a wavelength of 515 nm?

5.825e+14

42. Which of the following types of radiation diffracts most when it passes through a diffraction grating? A. Red. B. Yellow. C. Blue. D. Violet.

A

46. An unpolarized beam of light of a single pure color can be split apart into two separate beams by using A. a birefringent material like calcite. B. the human retina. C. metal-ceramic inversion. D. a thin layer of oil.

A

1. Which of the following colors has the lowest frequency? A. Yellow B. Orange C. Red D. Green

C. Red

Light with a wavelength of 500 nm (5. 10-7 m) is incident upon a double slit with a separation of 0.48 mm (4.80 10-4 m). A screen is located 2.4 m from the double slit. At what distance from the center of the screen will the second dark fringe beyond the center fringe appear?

3.75 mm

What is the wavelength of the radio waves for a station broadcasting at 915 kilohertz?

328 m

2. Which of the following is not an electromagnetic wave? A. Sound B. Microwaves C. Infrared D. X-ray E. Light

A. Sound

25. Two light waves combine and produce a region of darkness. Which of the following must be true? A. The waves were a half-wavelength out of phase. B. The waves had different wavelengths. C. The waves came from the same source. D. The waves were unpolarized.

A. The waves were a half-wavelength out of phase.

35. A beam of "unpolarized" light A. can be polarized by reflecting it from a flat surface. B. has a polarization direction that is constantly rotating. C. does not have any polarized waves. D. contains a single light wave with a fixed polarization direction.

A. can be polarized by reflecting it from a flat surface.

10. The frequency of blue light is ______ that of green light. A. greater than B. less than C. same as D. greater, same or less, depending on a source of light

A. greater than

9. The wavelength of red light is ______ that of a green light. A. greater than B. less than C. same as D. greater, same or less, depending on a source of light

A. greater than

31. The diffraction of light by the iris of the eye limits A. the ability of our eyes to resolve very fine details. B. the color response of our eyes. C. our ability to see in the dark. D. our peripheral vision.

A. the ability of our eyes to resolve very fine details.

27. A thin layer of oil floats on a water puddle. An observer sees a colored pattern due to interference of light reflected from A. the oil/air interface AND the oil/water interface. B. ONLY the oil/air interface. C. ONLY the oil/water interface. D. the oil/air interface OR the oil/water interface, but not both.

A. the oil/air interface AND the oil/water interface.

5. In Young's double-slit experiment, light was first passed through a narrow single slit before going on to the double-slits. The reason for the first slit was A. to ensure a constant phase relationship between the interfering light waves. B. to reduce the brightness of the light so the interference pattern could be seen. C. to polarize the light. D. to screen out all wavelengths except those in the visible light spectrum.

A. to ensure a constant phase relationship between the interfering light waves.

16. Electromagnetic waves that travel through the air are A. transverse waves. B. longitudinal waves. C. a 50/50 combination of transverse and longitudinal waves. D. mostly transverse with small admixture of longitudinal. E. mostly longitudinal with small admixture of transverse.

A. transverse waves.

27. A thin layer of oil floats on a water puddle. An observer sees a colored pattern. This happens because A. two surfaces each transmit some light and reflect some light. B. oil always does this, even if it is not on water. C. water transmits light and never reflects light. D. sunlight's frequency range shifts to infrared at the boundary of water and oil.

A. two surface each transmit some light and reflect some light.

44. Ultraviolet light has ________ wavelength and __________ frequency relative to visible light. A. shorter; smaller B. shorter; larger C. longer; smaller D. longer; larger

B

Electromagnetic waves that travel through the air are A. longitudinal waves B. transverse waves C.mostly transverse with small admixture of longitudinal D. mostly longitudinal with small admixture of transverse E. a 50/50 combination of transverse and longitudinal waves

B

When you see your shadow on a sunny day, it has a fuzzy edge. This is A. an example of diffraction. B. not caused by diffraction because the wavelength of visible light is too small to produce visible diffraction around a person. C. not caused by diffraction because diffraction only occurs for openings, not objects blocking light. D. not caused by diffraction because there are too many wavelengths in sunlight to see the effect.

B

17. If the only light present is yellow, what color will a blue sweater appear to be? A. Blue B. Black. C. White D. Yellow E. Green

B. Black.

13. What primary color must be added to magenta light to produce white light? A. Red B. Green C. Yellow D. Magenta E. Blue

B. Green

28. A piece of ordinary glass transmits about 92% of the visible light incident on the glass. The transmittance of the glass can be increased by A. increasing the intensity of the incident light. B. applying an anti-reflective coating to both sides of the glass. C. slightly tilting the glass with respect to the light beam. D. making the glass thicker.

B. applying an anti-reflective coating to both sides of the glass.

12. If a surface is illuminated by magenta light and the red is absorbed, then the color of the surface will appear as A. green. B. blue. C. yellow. D. red.

B. blue.

24. Under the correct conditions, two light waves can produce regions of reinforcement and regions of cancellation. This phenomenon is known as A. polarization. B. interference. C. reflection. D. refraction.

B. interference.

37. The leaves of an oak tree are green and those leaves use light to help the tree grow. If the tree was exposed only to green light A. it would grow more quickly because green light is used by the tree. B. it would not grow well because the tree does not use much green light compared to other wavelengths. C. the growth rate of the tree would not change. D. the growth rate would depend on how hot the green light was.

B. it would not grow well because the tree does not use much green light compared to other wavelengths.

16. Electromagnetic waves that travel through a vacuum are not A. transverse waves. B. longitudinal waves. C. able to propagate, since there is no atmosphere. D. oscillating.

B. longitudinal waves.

32. A common use of a diffraction grating is to A. split light in to different polarizations. B. separate light into its separate wavelengths. C. reflect light into a different direction. D. focus light onto the retina.

B. separate light into its separate wavelengths.

21. A property of electromagnetic waves that makes them different than other kinds of waves such as sound or water waves is that A. they are transverse waves. B. they do not require a medium. C. their speed can change when moving in different media. D. they have many possible wavelengths.

B. they do not require a medium.

36. Polaroid sunglasses are designed to transmit primarily A. horizontally polarized light. B. vertically polarized light. C. longitudinal light waves. D. refracted waves. E. light other than blue.

B. vertically polarized light.

43. Radio waves have ________ wavelength and __________ frequency relative to visible light. A. shorter; smaller B. shorter; larger C. longer; smaller D. longer; larger

C

45. Prisms and diffraction gratings can both A. change sunlight into a single color. B. invert a light ray's frequency and wavelength C. break the incoming light beam into its constituent colors. D. slow down light to a few meters per second, if used back-to-back.

C

The energy of a red photon is__ that of a green photon A. depending on a source of photons. B. same as C. less than D. greater than

C

The visible portion of the electromagnetic spectrum is called light. One of the important properties of light is that A. it carries energy but not momentum. B. it carries momentum but not energy. C. it has the highest known speed. D. it cannot be deflected or bent from straight lines.

C

40. When diffraction of light occurs with a single slit, A. only one interference fringe can be seen. B. a central bright spot with one dimmer spot on each side can be seen. C. a number of interference fringes are produced around the central bright spot. D. the interference fringes have the same brightness as the central bright spot.

C. a number of interference fringes are produced around the central bright spot.

8. When ultraviolet light reflects from a violet surface, we see A. violet B. red C. black D. white

C. black

30. When a beam of light passes through a narrow slit we can observe some light in the "geometrical" shadow of the slit. This light arrived by the process of A. reflection. B. refraction. C. diffraction. D. interference.

C. diffraction.

38. If a person has a shiny nose, applying powder will remove the shine without reducing the amount of light reflecting from the nose. This is an example of A. polarization. B. diffraction. C. diffuse reflection. D. specular reflection.

C. diffuse reflection.

15. The daytime sky is blue, on sunny days, because the atmosphere A. is most efficient at scattering red light. B. absorbs blue light. C. is more efficient at scattering blue light. D. absorbs the red light. E. contains small amounts of water vapor that give the air its blue color.

C. is more efficient at scattering blue light.

18. The evening sunsets are reddish orange because the atmosphere A. is most efficient at scattering red light. B. absorbs blue light. C. is more efficient at scattering blue light. D. absorbs the red light. E. contains small amounts of red dust that give the air its red color.

C. is more efficient at scattering blue light.

33. The polarization of a light wave is determined by the direction A. of the light's velocity. B. perpendicular to both the electric and magnetic field. C. of the oscillating electric field. D. of the fluorescent tube used as a light source.

C. of the oscillating electric field.

11. Which two primary colors can be added to produce yellow? A. red and blue B. green and magenta C. red and green D. blue and green E. pink and mauve

C. red and green

4. The primary difference between x-rays and visible light is that A. they have different amplitudes. B. x-rays travel faster than visible light. C. they have different wavelengths. D. x-rays do not have a magnetic field associated with their electric field. E. x-rays cannot be absorbed by anything.

C. they have different wavelengths.

22. A common property of all waves is the relationship between the speed (v), the wavelength (l) and the frequency of the wave (f). The correct equation for this relationship is A. f = vl. B.l = vf. C. v = fl. D. v = f / l.

C. v = fl.

23. The correct value for the speed of light in air is A. 1.86X105 feet/s. B. 3.0X105 m/s. C. 1.86X105 miles/h. D. 3X108 m/s. E. 3X105 km/h.

D. 3X108 m/s.

14. The normal human eye can detect colors whose wavelengths range from 400 nm to A. 550 nm. B. 600 nm. C. 650 nm. D. 700 nm. E. 750 nm.

D. 700 nm.

Which of the following colors has the shortest wavelength? A. Yellow. B. Orange. C. Red. D. Green.

D. Green

3. Which statement is true? A. Electromagnetic waves can't travel in perfect vacuum. B. Speed of light in air is lower than in glass. C. Radio waves in the AM band are not electromagnetic waves. D. Some electromagnetic waves will pass through walls that light cannot penetrate. E. In air light travels much faster than radiation from microwave oven.

D. Some electromagnetic waves will pass through walls that light cannot penetrate.

29. Which of the following waves exhibit interference? A. Sound B. Water C. Light D. Sound, water and light. E. None of the choices.

D. Sound, water and light.

26. A beam of orange light illuminates two slits that are closely spaced. The resulting intensity pattern is a series of bright and dark fringes. What happens to the intensity pattern if we now change to blue light? A. Nothing changes. B. The series of bright and dark fringes changes to circular fringes. C. The series of bright and dark fringes spreads out. D. The series of bright and dark fringes gets closer together. E. The series of bright and dark fringes disappears.

D. The series of bright and dark fringes gets closer together.

41. When unpolarized light passes through a polarizing filter, A. all the light passes through and remains unpolarized. B. all the light passes though and is now polarized. C. about half the light passes through and remains unpolarized. D. about half the light passes through and is now polarized. E. it is completely absorbed by the filter.

D. about half the light passes through and is now polarized.

19. EM waves tend to be scattered the most by an object that is A. magnetic. B. a liquid. C. conducting. D. about the same size as the wave. E. reflective.

D. about the same size as the wave.

7. The light from an incandescent bulb is composed of A. only red, green, and blue light. B. only red, yellow, and turquoise. C. only red and blue. D. all wavelengths in the visible portion electromagnetic spectrum. E. None of the choices is correct.

D. all wavelengths in the visible portion electromagnetic spectrum.

20. When you look at a white light through a blue piece of glass, you observe blue light. This means that the blue glass A. absorbs all of the blue light. B. reflects all of the blue light. C. transmits all colors except blue. D. transmits only the blue light. E. transmits only cyan and magenta.

D. transmits only the blue light.

34. One common way to polarize a beam of light is to A. filter out the longest wavelengths of the spectrum. B. filter out the shortest wavelengths of the spectrum. C. slow it down using a piece of glass. D. use a sheet of Polaroid material.

D. use a sheet of Polaroid material.

For a given number of photons, which property of visible electromagnetic waves changes with color? A. Wavelength B. Frequency C. Energy D. None of these. E. All of these

E

6. For visible light, which property of visible electromagnetic waves changes with color? A. Amplitude B. Frequency C. Wavelength D. Amplitude and frequency E. Frequency and wavelength

E. Frequency and wavelength

What primary color must be added to cyan light to produce white light?

Red