Physics 12 - Chapter 10 Quiz

Name:

True/False

Indicate whether the sentence or statement is true or false.

Polarization provided the proof that light is a longitudinal wave.

For single-slit diffraction, the smaller the slit width, the smaller the distance between adjacent maxima and minima.

For single-slit diffraction, the longer the wavelength, the greater the distance between maxima.

For single-slit diffraction, minima, or dark fringes, occur at

, ....

The smaller the aperture of an optical instrument, the better its resolution.

For transmitted light in thin films, destructive interference occurs for reflected light when the film has a thickness of

, …, where l is the wavelength in the film.

In an interferometer, when the mirror moves so that four fringes are observed, the mirror has moved a distance of 2l, where l is the wavelength of the light source.

Hertz postulated and Maxwell proved that light and radio waves travel through space at the speed of light.

Radio waves originate from an oscillating electric field in an antenna.

10.

Electromagnetic waves consist of electric and magnetic fields oscillating in phase, perpendicular to each other and to the direction of wave propagation.

11.

Ionizing radiation originates in light with a wavelength longer than that of visible light.

Multiple Choice

Identify the letter of the choice that best completes the statement or answers the question.

12.

Figure 1 shows a single slit, with lines marking the direction to a point P in the diffraction pattern; X and Y are the edges of the slit. The possible value for the path difference PY – PX that places P at the second intensity minimum from the central maximum is

Figure 1

a.
b.
c.
d.	2
e.

13.

The possible value for the path difference PY – PX in Figure 1 that places P at the intensity maximum nearest the central maximum is

a.
b.
c.
d.	2
e.

14.

Colours are often observed when gasoline is poured onto water. This effect is primarily produced by

a.	diffraction
b.	diffuse reflection
c.	interference
d.	absorption
e.	incandescence

15.

Figure 2 shows three experiments for studying the interaction of monochromatic light with thin films of glass of various thickness t. The eye represents the position of the observer. The observer sees constructive interference in

Figure 2

a.	I only
b.	II only
c.	III only
d.	I and III only
e.	II and III only

16.

A thin coating, of refractive index 1.2, is applied to a glass camera lens, of refractive index n > 1.2, to minimize the intensity of the light reflected. The wavelength of the light is

. The coating thickness required to minimize the intensity of reflected light is

a.
b.
c.
d.
e.

17.

The type of electromagnetic radiation that travels at the greatest speed is

a.	radio waves
b.	visible light
c.	X rays
d.	gamma rays
e.	They all travel at the same speed.

18.

The three types of radiation placed in order of increasing frequency are

a.	gamma rays, radio waves, infrared radiation
b.	radio waves, gamma rays, infrared radiation
c.	infrared radiation, radio waves, gamma rays
d.	gamma rays, infrared radiation, radio waves
e.	radio waves, infrared radiation, gamma rays