Log inSign up for FREE
Library

8.3 Sound and Light Unit - WAVES test

Last updated over 3 years ago
6 questions

Wave Pool

At the Wave Pool, a wave-making machine creates big water waves for swimmers. Students study the Wave Machine: a large, motor-driven paddle that moves back and forth (see figure to the right). Every time the paddle moves forward it pushes water and makes a wave. The students watched the waves pass by them in the Wave Pool.
The students noticed that the waves produced by the Wave Machine have properties that are the same for ALL waves. The Wave Model (see figure) uses a sine wave to represent a side view of the water surface. The undisturbed water surface level is labeled “Rest Position”.

Complete the Wave Model by choosing the correct terms for the areas labeled A and B.
Required
1

What is the correct label for A?

Required
1

What is the correct label for B?

The Wave Machine operator demonstrated that she could change the number of waves produced by changing how fast the Wave Machine paddle moves back and forth.
The students started counting how many waves pass by in a minute, and noticed that this number changed from Time 1 to Time 2 (diagram on right) as the Wave Machine paddle increased its speed.
Required
3
Complete the following sentences to describe changes in the waves between Time 1 and Time 2. For each sentence, choose one of the word choices below and drag it into place.
  • The ______________ of the waves increased from Time 1 to Time 2.
  • The _______________ of the waves decreased from Time 1 to Time 2.
  • The ______________ of the waves did not change from Time 1 to Time 2.
Other Answer Choices:
Frequency
Wavelength
Amplitude
The Wave Machine operator returned the Wave Machine to the original settings. Then she adjusted the controls to show the students another way that she can change the waves, by changing the amount of force the paddle uses to push on the water.
The students started watching the waves, and noticed the waves changed from Time 3 to Time 4 (diagram on right) as the operator adjusted the Wave Machine controls to make the paddle increase the force of its pushes on the water.
Required
3
Complete the following sentences to describe changes in the waves between Time 3 and Time 4. For each sentence, choose one of the word choices below and drag it into place.
  • The amplitude of the waves ______________ from Time 3 to Time 4.
  • The frequency of the waves ___________________ from Time 3 to Time 4.
  • The wavelength of the waves ___________________ from Time 3 to Time 4.
Other Answer Choices:
did not change
decreased
increased
did not change
The operator then set up the Wave Machine to make waves continuously.
The students watched swimmers in different parts of the pool, wondered about where the swimmers should be located to experience the highest energy waves, or if it mattered at all where they were in the pool.
Required
1

In which area of the pool would a swimmer experience the highest energy waves? Choose one answer below.

Required
3

Describe why you chose your answer above for question 5. Use your knowledge of waves and wave energy and refer to the labeled wave pool diagram.