PHY100 - Chapter 16: Light waves and Colors

C. 30 GHz

1. Microwaves used in laboratory experiments often have a wavelength of about 1 cm. What is the frequency of these waves? A. 10 GHz B. 20 GHz C. 30 GHz D. 40 GHz

C. Green

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

D. v = fλ

10. A common property of all waves is the relationship between the speed (v), the wavelength (λ), and the frequency of the wave (f). The correct equation for this relationship is which of the following? A. λ = vf B. f = vλ C. v = f/λ D. v = fλ

D. 500 m

2. What is the wavelength of the radio waves from a station broadcasting at 600 kilohertz? A. 100 m B. 200 m C. 400 m D. 500 m

B. Sound

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

A. 5.77x10^14 Hz

3. What is the frequency of green light waves with a wavelength of 520 nm? A. 5.77x10^14 Hz B. 5.77x10^13 Hz C. 5.77x10^12 Hz D. 5.77x10^11 Hz

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

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

B. they have different wavelengths.

4. The primary difference between infrared and visible light is that A. infrared travels faster than visible light. B. they have different wavelengths. C. infrared does not have a magnetic field associated with its electric field. D. no materials currently known have the ability to reflect infrared. E. they have different amplitudes.

D. 3x10^17 Hz

4. X rays often have a wavelength of about 10-10 m. What is the frequency of such waves? A. 1x10^18 Hz B. 3x10^18 Hz C. 1x10^17 Hz D. 3x10^17 Hz

E. frequency and wavelength

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

A. Blue

5. What is the color of light with a wavelength of 470 nm. A. Blue B. Red C. Yellow D. Green

D. all wavelengths in the visible portion of the electromagnetic spectrum.

6. 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 of the electromagnetic spectrum. E. None of the choices is correct

B. less than

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

E. about the same size as the wave.

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

B. they do not require a medium

9. 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.