7-2.1 Check

If the amplitude of ocean waves increases by a factor of 1.1, by how much does the energy increase?

• The energy increases by a factor of 1.21

• The energy increases by a factor of 1.1

• The energy increases by a factor of 0.55

• The energy increases by a factor of 11

A worker uses a jackhammer to break up a sidewalk. What kind of waves does the jackhammer produce?

• Longitudinal Waves

• Transverse Waves

• Longitudinal and Transverse Waves

• Longitudinal and Surface Waves

A musician increases the wavelength of the sound waves she produces without changing their speed. What must be happening to the frequency of the waves?

• It must be decreasing

• It must be increasing

• It will stay the same because speed isn't changing

What does it mean to say that a wave is a cyclic, or periodic, disturbance? Choose two

• A wave is a cycle of peaks

• A wave will have the same distance between each peak

• Depending on frequency, the distance between peaks can change

• Depending on amplitude, the peaks can change

How do you measure the amplitude of a longitudinal wave?

• How much the medium is compressed

• The distance between the rest position and the crest

• The distance between compressions

• The distance between peaks

A friend tells you a way to estimate how far away a lightning bolt strikes. You count the number of seconds between the seeing the flash and hearing the thunderclap. Then you divide that number by five to get the distance in miles. In terms of physics of light and sound waves, does this method make sense?

• You'll see the light before you hear the sound so by waiting to hear the sound you can find the distance

• No, you'll hear the sound before you see the light

• No, the light and sound will reach you at the same time