Friday

February 27, 2015

February 27, 2015

Posted by **Sam** on Sunday, January 24, 2010 at 2:07pm.

1. (0.5 hertz)

2. (1hertz) (ANSWER)

3. (2 hertz)

And the period is (FROM THE QUESTION BEFORE)

1. (0.5 seconds) (ANSWER)

2. (1 second)

3. (2 seconds)

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

ANSWER: 220

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

ANSWER: 16

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?

ANSWER: 600 vibrations per second.

( b.) What is the wavelength? (Assume the speed of sound is 340 m/s.)

ANSWER: 0.57 (rounded) meters

5. When an automobile moves towards a listener, the sound of its horn seems relatively _____

1. High pitched (ANSWER)

2. Low pitched

3. Normal

When moving away from the listener, its horn seems ______

1. High pitched

2. Low pitched (ANSWER)

3. Normal

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

1. Wave Speed

2. Wave Frequency (ANSWER)

Thanks so much for the help!!

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