Chapter 21 Questions

Question 1

Rank the following (gamma rays, visible light, and radio waves, x rays) in order of increasing wavelength

Answer 1

Gamma rays (smallest wavelength), X rays, visible light, radio waves (largest wavelength)

Question 2

Which of the following statements are true regarding electromagnetic waves traveling through a vacuum?

Answer 2

All waves travel at the speed of light (3E8 m/s)
The electric and magnetic fields associated with the waves are perpendicular to eachother and to the direction of the wave propagation

Question 3

In the apparatus such as that in the figure below, suppose the black disk is replaced by one with half the radius. Which of the following are different after the disk is replaced?

Answer 3

The radiation force on the disk
The radiation momentum delivered to the disk in a given time interval

Question 4

Which of the following statements is true about light waves?

Answer 4

the shorter the wavelength, the higher the frequency
The lower the frequency, the longer the wavelength