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Physics

Multiple Choice

PhysicsMultiple Choice

Multiple Choice

15.1 The Electromagnetic Spectrum

17.

Which type of EM radiation has the shortest wavelengths?

  1. gamma rays
  2. infrared waves
  3. blue light
  4. microwaves
18.

Which form of EM radiation has the most penetrating ability?

  1. red light
  2. microwaves
  3. gamma rays
  4. infrared radiation
19 .
Why are high-frequency gamma rays more dangerous to humans than visible light?
  1. Gamma rays have a lower frequency range than visible light.
  2. Gamma rays have a longer wavelength range than visible light.
  3. Gamma rays have greater energy than visible light for penetrating matter.
  4. Gamma rays have less energy than visible light for penetrating matter.
20 .
A dog would have a hard time stalking and catching a red bird hiding in a field of green grass. Explain this in terms of cone cells and color perception.
  1. Dogs are red-green color-blind because they can see only blue and yellow through two kinds of cone cells present in their eyes.
  2. Dogs are only red color-blind because they can see only blue and yellow through two kinds of cones cells present in their eyes.
  3. Dogs are only green color-blind because they can see only blue and yellow through two kinds of cones cells present in their eyes.
  4. Dogs are color-blind because they have only rods and no cone cells present in their eyes.

15.2 The Behavior of Electromagnetic Radiation

21.

To compare the brightness of light bulbs for sale in a store, you should look on the labels to see how they are rated in terms of ____.

  1. frequency
  2. watts
  3. amps
  4. lumens
22.

What is the wavelength of red light with a frequency of 4.00 × 1014 Hz?

  1. 2.50 × 1014 m
  2. 4.00 × 1015 m
  3. 2.50 × 106 m
  4. 7.50 × 10-7 m
23.

What is the distance of one light year in kilometers?

  1. 2.59 × 1010 km
  2. 1.58 × 1011 km
  3. 2.63 × 109 km
  4. 9.46 × 1012 km
24.

How does the illuminance of light change when the distance from the light source is tripled? Cite the relevant equation and explain how it supports your answer.

  1. Illuminance =  P  4π r 2 ; Illuminance =  P  4π r 2 ; if distance is tripled, then the illuminance increases by 19 times.
  2. Illuminance =  P  4π r ; Illuminance =  P  4π r ; if distance is tripled, then the illuminance decreases by 13 times.
  3. Illuminance = P · 4π r 2 ; Illuminance = P · 4π r 2 ; if distance is tripled, then the illuminance decreases by 9 times.
  4. Illuminance = P · 4π r ; Illuminance = P · 4π r ; if distance tripled, then the illuminance increases by 3 times.
25.

A light bulb has an illuminance of 19.9 lx at a distance of 2 m . What is the luminous flux of the bulb?

  1. 500 lm
  2. 320 lm
  3. 250 lm
  4. 1,000 lm
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