# Chapter 24: The Wave Nature Of Light

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• 1.
Which of the following is a false statement?
• A.

All points on a given wave front have the same phase.

• B.

Rays are always perpendicular to wave fronts.

• C.

All wave fronts have the same amplitude.

• D.

The spacing between adjacent wave fronts is one-half wavelength.

• 2.
The wave theory of light is attributed to
• A.

Christian Huygens.

• B.

Isaac Newton.

• C.

Max Planck.

• D.

Albert Einstein.

• 3.
The particle theory of light is attributed to
• A.

Christian Huygens.

• B.

Isaac Newton.

• C.

Max Planck.

• D.

Albert Einstein.

• 4.
When a light wave enters into a medium of different optical density,
• A.

Its speed and frequency change.

• B.

Its speed and wavelength change.

• C.

Its frequency and wavelength change.

• D.

Its speed, frequency, and wavelength change.

• 5.
When a beam of light (wavelength = 590 nm), originally traveling in air, enters a piece of glass (index of refraction 1.50), its frequency
• A.

Increases by a factor of 1.50.

• B.

Is reduced to 2/3 its original value.

• C.

Is unaffected.

• D.

None of the given answers

• 6.
When a beam of light (wavelength = 590 nm), originally traveling in air, enters a piece of glass (index of refraction 1.50), its wavelength
• A.

Increases by a factor of 1.50.

• B.

Is reduced to 2/3 its original value.

• C.

Is unaffected.

• D.

None of the given answers

• 7.
What principle is responsible for light spreading as it passes through a narrow slit?
• A.

Refraction

• B.

Polarization

• C.

Diffraction

• D.

Interference

• 8.
Radio waves are diffracted by large objects such as buildings, whereas light is not noticeably diffracted. Why is this?
• A.

Radio waves are unpolarized, whereas light is plane polarized.

• B.

The wavelength of light is much smaller than the wavelength of radio waves.

• C.

The wavelength of light is much greater than the wavelength of radio waves.

• D.

Radio waves are coherent and light is usually not coherent.

• 9.
What principle is responsible for alternating light and dark bands when light passes through two or more narrow slits?
• A.

Refraction

• B.

Polarization

• C.

Dispersion

• D.

Interference

• 10.
Two light sources are said to be coherent if they
• A.

Are of the same frequency.

• B.

Are of the same frequency, and maintain a constant phase difference.

• C.

Are of the same amplitude, and maintain a constant phase difference.

• D.

Are of the same frequency and amplitude.

• 11.
What do we mean when we say that two light rays striking a screen are in phase with each other?
• A.

When the electric field due to one is a maximum, the electric field due to the other is also a maximum, and this relation is maintained as time passes.

• B.

They are traveling at the same speed.

• C.

They have the same wavelength.

• D.

They alternately reinforce and cancel each other.

• 12.
Two beams of coherent light travel different paths arriving at point P. If the maximum constructive interference is to occur at point P, the two beams must
• A.

Travel paths that differ by a whole number of wavelengths.

• B.

Travel paths that differ by an odd number of half-wavelengths.

• 13.
Two beams of coherent light travel different paths arriving at point P. If the maximum destructive interference is to occur at point P, the two beams must
• A.

Travel paths that differ by a whole number of wavelengths.

• B.

Travel paths that differ by an odd number of half-wavelengths.

• 14.
At the first maxima on either side of the central bright spot in a double-slit experiment, light from each opening arrives
• A.

In phase.

• B.

90° out of phase.

• C.

180° out of phase.

• D.

None of the given answers

• 15.
At the first minima on either side of the central bright spot in a double-slit experiment, light from each opening arrives
• A.

In phase.

• B.

90° out of phase.

• C.

180° out of phase.

• D.

None of the given answers

• 16.
At the second maxima on either side of the central bright spot in a double-slit experiment, light from
• A.

Each opening travels the same distance.

• B.

One opening travels twice as far as light from the other opening.

• C.

One opening travels one wavelength of light farther than light from the other opening.

• D.

One opening travels two wavelengths of light farther than light from the other opening.

• 17.
In a Young's double slit experiment, if the separation between the slits decreases, what happens to the distance between the interference fringes?
• A.

It decreases.

• B.

It increases.

• C.

It remains the same.

• D.

There is not enough information to determine.

• 18.
In a double-slit experiment, it is observed that the distance between adjacent maxima on a remote screen is 1.0 cm. What happens to the distance between adjacent maxima when the slit separation is cut in half?
• A.

It increases to 2.0 cm.

• B.

It increases to 4.0 cm.

• C.

It decreases to 0.50 cm.

• D.

It decreases to 0.25 cm.

• 19.
One beam of coherent light travels path P1 in arriving at point Q and another coherent beam travels path P2 in arriving at the same point. If these two beams are to interfere destructively, the path difference P1 - P2 must be equal to
• A.

An odd number of half-wavelengths.

• B.

Zero.

• C.

A whole number of wavelengths.

• D.

A whole number of half-wavelengths.

• 20.
If a wave from one slit of a Young's double slit experiment arrives at a point on the screen one-half wavelength behind the wave from the other slit, which is observed at that point?
• A.

Bright fringe

• B.

Dark fringe

• C.

Gray fringe

• D.

Multi-colored fringe

• 21.
Why would it be impossible to obtain interference fringes in a double-slit experiment if the separation of the slits is less than the wavelength of the light used?
• A.

The very narrow slits required would generate many different wavelengths, thereby washing out the interference pattern.

• B.

The two slits would not emit coherent light.

• C.

The fringes would be too close together.

• D.

In no direction could a path difference as large as one wavelength be obtained, and this is needed if a bright fringe, in addition to the central fringe, is to be observed.

• 22.
The separation between adjacent maxima in a double-slit interference pattern using monochromatic light is
• A.

Greatest for red light.

• B.

Greatest for green light.

• C.

Greatest for blue light.

• D.

D) the same for all colors of light.

• 23.
The principle which explains why a prism separates white light into different colors is
• A.

Refraction.

• B.

Polarization.

• C.

Dispersion.

• D.

Total internal reflection.

• 24.
The principle which allows a rainbow to form is
• A.

Refraction.

• B.

Polarization.

• C.

Dispersion.

• D.

Total internal reflection.

• 25.
White light is
• A.

Light of wavelength 550 nm, in the middle of the visible spectrum.

• B.

A mixture of all frequencies.

• C.

A mixture of red, green, and blue light.

• D.

The term used to describe very bright light.

• E.

The opposite (or complementary color) of black light.

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