1. What is the electromagnetic spectrum?

a. a device such as a diffraction grating or prism that separates light into colors

b. the rainbow of colors seen in an oil coating on an electromagnet

c. the complete collection of all colors of light, arranged from red to violet

d. the complete collection of electromagnetic waves, from radio waves to gamma rays

 

2. Suppose Galileo and his assistant were 1 km apart when Galileo uncovered his lantern to try to measure the speed of light. How long would it have taken the light signal to reach his assistant?

a. 3.0*10^8 s

b. 3.3*10^-6 s

c. 1.0 s

d. 3.3*10^-9

 

3. How did Michelson measure the speed of light?

a. by watching for eclipses

b. by observe how light was refracted in passing from air to water

c. by measure the wavelength of light

d. by using rotating mirrors to measure the time of round trip travel of light onto a distant mountain

 

4.Which of theses has the longest wavelength?

a. X rays

b. visible light

c. ultraviolet

d. radio waves

 

5. What produces the light from a fluorescent light bulb?

a. A coating on the tube converts UV light into visible light

b. Changes in energy of electrons in neon gas produce the light emission

c. A filament heated to glow white hot emits the light

d. An electric current through mercury vapor directly emits most of the visible light

 

6. The light emitted by an argon laser light includes light with a wavelength of 488 nm. What is the frequency of this light?

a. 160 Hz

b. 6.15*10^14 Hz

c. 6.15 * 10^5 Hz

d. 1.6 10^11 Hz

 

7. A car approaches a police radar gun. How does the wavelength of the signal detected within the car compare with that emitted by the radar gun?

a. The wavelength detected inside the car is the same

b. The wavelength detected inside the car in shorter

c. The wavelength detected inside the car is longer

d. The wavelength deteected inside the car might be shorter or longer depending on speed range

 

8. What did Young's observation of an interference pattern for light show about the nature of light?

a. Light behaves as a wave

b. The speed of light is a constant

c. Light travels at extremely high speed.

d. Light consists of partices

 

9. What effect does a diffraction grating have on white light?

a. produces light polarized in one direction

b. makes light behave as a particle

c. creates a spectrum by producing intensity maxima in different directions for different wavelenghts

d. focuses light to form an image

 

10. Whcih of these does not result directly in reflection?

a. light incident on a sheet of paper

b. shining light from a spacecraft into space

c. light from a submerged light source aimed upward at the water surface

d. shining light on the surface of a deep lake

 

11. What is the critical angle theta_c for total internal reflection if the material is clear acrylic, with a refractive index of 1.5?

a. 49 degrees

b. 90 degrees

c. 42 degrees

d. 62 degrees

 

12. If a beam of light from a He-Ne laser has wavelength 543 nm in air, what is its wavelength in water? The index of refraction for water is 1.33.

a. 360 nm

b. 722 nm

c. 408 nm

d. 540 nm

 

13. When you stand by the side of a pool, someone swimming underwater appears to be in a different location than she really is. This effect is caused by-----

a. reflection

b. refraction

c. interference

d. diffraction

 

14. A rainbow results from the way that light of different wavelengths----

a. diffracts differently within water drops

b. refracts differently within water drops

c. reflects differently within water drops

d. interferes differently within water drops

 

15. You are standing in front of a large, flat mirror at a distance of 2.0 m from the mirror. A friend stand 1 m to your right. What does your friend see as the position of your reflection in the mirror?

 

a. 2.0 m behind the mirror, directly in front of you

b. 4.0 m behind the mirror, directly in front of you

c. 4.0 m behind the mirror, in front of a point between the two of you

d. 2.0 m behind the mirror, in front of a point between the two of you

 

16. A convex mirror has a focal length of 40 cm. You place an object on the principal axis 20 cm in front of the mirror. What kind of image forms, if any?

a. No image

b. an inverted real image

c. an inverted virtual image

d. a virtual image larger than the object

e. a virtual image smaller than the object

 

17. Which part or parts of the eye change the direction of light rays to form an image?

a. the lense only

b. the cornea only

c. the iris

d. both lens and cornea

 

18. What kind of image does the lens system of the eye form on the retina?

a.virtual and inverted

b. real and upright

c. real and inverted

d. virtual and upright

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