# Science

posted by Sam

1. A girl on a playground swing makes a complete to-and-fro swing each 2 seconds. The frequency of swing is
1. (0.5 hertz)
3. (2 hertz)
And the period is (FROM THE QUESTION BEFORE)
2. (1 second)
3. (2 seconds)

2. The period of a 444-hertz sound wave is _____ second(s).

3. A marine weather station reports waves along the shore that are 8 seconds apart. The frequency of the waves is therefore _____ hertz.

4. The annoying sound from a mosquito occurs because it beats its wings at the average rate of 600 wingbeats per second.
( a.) What is the frequency of the soundwaves?
( b.) What is the wavelength? (Assume the speed of sound is 340 m/s.)

5. When an automobile moves towards a listener, the sound of its horn seems relatively _____
2. Low pitched
3. Normal
When moving away from the listener, its horn seems ______
1. High pitched
3. Normal

6. The changed pitch of the Doppler Effect is due t changes in_______
1. Wave Speed

Thanks so much for the help!!

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