Chapter 19: Vibrations and Waves

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Chapter 19 Vibrations and Waves.

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Presentation transcript:

Chapter 19: Vibrations and Waves © 2015 Pearson Education, Inc.

A wiggle in time is a vibration. wave. Both of these. None of these. Answer: A) vibration. © 2015 Pearson Education, Inc.

A wiggle in time is a vibration. wave. Both of these. None of these. Answer: A) vibration. © 2015 Pearson Education, Inc.

A wave is a vibration in space. time. Both of these. None of these. Answer: C) Both of these. © 2015 Pearson Education, Inc.

A wave is a vibration in space. time. Both of these. None of these. Answer: C) Both of these. © 2015 Pearson Education, Inc.

When we consider how frequently a pendulum swings to and fro, we're talking about its frequency. period. wavelength. amplitude. Answer: A) frequency. © 2015 Pearson Education, Inc.

When we consider how frequently a pendulum swings to and fro, we're talking about its frequency. period. wavelength. amplitude. Answer: A) frequency. © 2015 Pearson Education, Inc.

When we consider the time it takes for a pendulum to swing to and fro, we're talking about the pendulum's frequency. period. wavelength. amplitude. Answer: B) period. © 2015 Pearson Education, Inc.

When we consider the time it takes for a pendulum to swing to and fro, we're talking about the pendulum's frequency. period. wavelength. amplitude. Answer: B) period. © 2015 Pearson Education, Inc.

When we consider how far a pendulum swings to and fro, we're talking about the pendulum's frequency. period. wavelength. amplitude. Answer: D) amplitude. © 2015 Pearson Education, Inc.

When we consider how far a pendulum swings to and fro, we're talking about the pendulum's frequency. period. wavelength. amplitude. Answer: D) amplitude. © 2015 Pearson Education, Inc.

The frequency of a wave is the inverse of its period. wavelength. amplitude. Answer: B) period. © 2015 Pearson Education, Inc.

The frequency of a wave is the inverse of its period. wavelength. amplitude. Explanation: Note the inverse relationship: f = 1/T, T = 1/f. Answer: B) period. © 2015 Pearson Education, Inc.

If the frequency of a particular wave is 20 Hz, its period is 1/20 second. 20 seconds. more than 20 seconds. None of the above. Answer: A) 1/20 second. © 2015 Pearson Education, Inc.

If the frequency of a particular wave is 20 Hz, its period is 1/20 second. 20 seconds. more than 20 seconds. None of the above. Explanation: Note when f = 20 Hz, T = 1/f = 1/20 Hz = 1/20 second. Answer: A) 1/20 second. © 2015 Pearson Education, Inc.

In Europe an electric razor completes 50 vibrations in 1 second In Europe an electric razor completes 50 vibrations in 1 second. The frequency of these vibrations is 50 Hz with a period of 1/50 second. 1/50 Hz with a period of 50 seconds. 50 Hz with a period of 50 seconds. 1/50 Hz with a period of 1/50 second. Answer: A) 50 Hz with a period of 1/50 second. © 2015 Pearson Education, Inc.

In Europe an electric razor completes 50 vibrations in 1 second In Europe an electric razor completes 50 vibrations in 1 second. The frequency of these vibrations is 50 Hz with a period of 1/50 second. 1/50 Hz with a period of 50 seconds. 50 Hz with a period of 50 seconds. 1/50 Hz with a period of 1/50 second. Explanation: Note when f = 50 Hz, T = 1/f = 1/50 Hz = 1/50 second. Answer: A) 50 Hz with a period of 1/50 second. © 2015 Pearson Education, Inc.

For a transverse wave, the distance between adjacent peaks in the direction of travel is its frequency. period. wavelength. amplitude. Answer: C) wavelength. © 2015 Pearson Education, Inc.

For a transverse wave, the distance between adjacent peaks in the direction of travel is its frequency. period. wavelength. amplitude. Explanation: The wavelength of a transverse wave is also the distance between adjacent troughs, or between any adjacent identical parts of the waveform. Answer: C) wavelength. © 2015 Pearson Education, Inc.

If you dip your finger repeatedly onto the surface of still water, you produce waves. The more frequently you dip your finger, the lower the wave frequency and the longer the wavelengths. higher the wave frequency and the shorter the wavelengths. Strangely, both of these. None of these. Answer: B) higher the wave frequency and the shorter the wavelengths. © 2015 Pearson Education, Inc.

If you dip your finger repeatedly onto the surface of still water, you produce waves. The more frequently you dip your finger, the lower the wave frequency and the longer the wavelengths. higher the wave frequency and the shorter the wavelengths. Strangely, both of these. None of these. Explanation: Strange indeed, if you seriously answered c.! Answer: B) higher the wave frequency and the shorter the wavelengths. © 2015 Pearson Education, Inc.

The speed of a wave can be found by multiplying its frequency by the period. wavelength. amplitude. None of the above. Answer: B) wavelength. © 2015 Pearson Education, Inc.

The speed of a wave can be found by multiplying its frequency by the period. wavelength. amplitude. None of the above. Answer: B) wavelength. © 2015 Pearson Education, Inc.

The vibrations along a transverse wave move in a direction along the wave. perpendicular to the wave. Both of these. None of these. Answer: B) perpendicular to the wave. © 2015 Pearson Education, Inc.

The vibrations along a transverse wave move in a direction along the wave. perpendicular to the wave. Both of these. None of these. Answer: B) perpendicular to the wave. © 2015 Pearson Education, Inc.

The vibrations along a longitudinal wave move in a direction along the wave. perpendicular to the wave. Both of these. None of these. Answer: A) along the wave. © 2015 Pearson Education, Inc.

The vibrations along a longitudinal wave move in a direction along the wave. perpendicular to the wave. Both of these. None of these. Answer: A) along the wave. © 2015 Pearson Education, Inc.

A common example of a longitudinal wave is sound. light. Both of these. None of these. Answer: A) sound. © 2015 Pearson Education, Inc.

A common example of a longitudinal wave is sound. light. Both of these. None of these. Answer: A) sound. © 2015 Pearson Education, Inc.

Wave interference occurs for water waves. sound waves. light waves. All of these. Answer: D) All of these. © 2015 Pearson Education, Inc.

Wave interference occurs for water waves. sound waves. light waves. All of these. Answer: D) All of these. © 2015 Pearson Education, Inc.

A standing wave is produced by reflected waves undergoing changes in frequency. changes in amplitude. interference. Doppler shifts. Answer: C) interference. © 2015 Pearson Education, Inc.

A standing wave is produced by reflected waves undergoing changes in frequency. changes in amplitude. interference. Doppler shifts. Answer: C) interference. © 2015 Pearson Education, Inc.

The Doppler effect is characteristic of sound waves. light waves. Both of these. None of these. Answer: C) Both of these. © 2015 Pearson Education, Inc.

The Doppler effect is characteristic of sound waves. light waves. Both of these. None of these. Answer: C) Both of these. © 2015 Pearson Education, Inc.

The Doppler effect is concerned with changes in wave frequency. speed. Both of these. None of these. Answer: A) frequency. © 2015 Pearson Education, Inc.

The Doppler effect is concerned with changes in wave frequency. speed. Both of these. None of these. Explanation: A common misconception is that the Doppler effect is a perceived change in speed—not so! Distinguish between speed (how fast) and frequency (how frequently)! Answer: A) frequency. © 2015 Pearson Education, Inc.

A shock wave is the result of wave interference. superposition. amplification. transference. Answer: B) superposition. © 2015 Pearson Education, Inc.

A shock wave is the result of wave interference. superposition. amplification. transference. Answer: B) superposition. © 2015 Pearson Education, Inc.

A sonic boom cannot be produced by an aircraft flying slower than the speed of sound. a whip. a speeding bullet. All of these. Answer: A) an aircraft flying slower than the speed of sound. © 2015 Pearson Education, Inc.

A sonic boom cannot be produced by an aircraft flying slower than the speed of sound. a whip. a speeding bullet. All of these. Comment: None of these produces a shock wave and a resulting sonic boom. Answer: A) an aircraft flying slower than the speed of sound. © 2015 Pearson Education, Inc.