The diagram below represents a transverse wave passing through a medium from left to right. Which of the following diagrams best represents the direction of vibration of the particles of the medium?

• 
• 
• 
• 

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112.39.c.7.C

Waves X and Y are moving through identical materials. When wave X moves through the material, the particles in the material move up and down. When wave Y moves through the material, the particles in the material move from side to side. What can be determined about the waves?

• Wave X is a longitudinal wave and wave Y is a longitudinal wave.

• Wave X is a transverse wave and wave Y is a longitudinal wave.

• Wave X is a longitudinal wave and wave Y is a transverse wave.

• Wave X is a transverse wave and wave Y is a transverse wave.

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112.39.c.7.C

Which of the following are examples of longitudinal waves? Select all that apply

• A speaker playing music

• A compression moving through a spring

• Light rays travelling from the Sun to the Earth

• An X ray providing an image of a broken bone

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112.39.c.7.C

A source of waves and an observer are both initially stationary. The observer will detect a steadily increasing frequency if which of the following occurs?

• He accelerates toward the source.

• He moves toward the source at a constant speed.

• The source accelerates away from him.

• The source moves away from him at a constant speed.

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112.39.c.7.D

The diagram below represents the letter P in front of a plane mirror. Which of the following diagrams best represents the image of P produced by the plane mirror?

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• 
• 
• 

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112.39.c.7.D

A ray of light strikes a mirror at an angle of incidence of 60°. What is the angle of reflection?

• 0°

• 30°

• 60°

• 90°

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112.39.c.7.D

The diagram below represents a light ray in air incident on a crown glass block. What will happen to the light ray when it enters the crown glass block?

• It will slow down and bend toward the normal.

• It will speed up and bend toward the normal.

• It will slow down and bend away from the normal.

• It will speed up and bend away from the normal.

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112.39.c.7.D

The diagram below represents a person standing 5 meters from a plane mirror and a chair located 2 meters from the mirror. What is the distance between the person and the image of the chair he observes through the mirror?

• 2 m

• 3 m

• 7 m

• 10 m

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112.39.c.7.D

An object 0.2 meter tall is located 0.5 meter from a converging lens with a focal length of 1.0 meter. How far from the lens is the image?

• A. 0.01 m

• B. 0.2 m

• C. 0.5 m

• D. 1.0 m

Answer explanation

1/f = 1/do + 1/di

1/1 = 1/0.5 + 1/-di

1-2 = 1/-di

-1 = 1/-di

di = i

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112.39.c.7.E

The diagram below depicts a converging lens of focal length F and an object placed between 1 and 2 focal lengths from the lens. Which of the following best describes the image of the object produced by the lens?

• A. Virtual and erect

• B. Real and inverted

• C. Real and erect

• D. Virtual and inverted

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112.39.c.7.E