Question 6 What is the wave speed if a wave has a period of 83 ms and a waveleng

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Question 6

What is the wave speed if a wave has a period of 83 ms and a wavelength of 3.0 m?

1. 4.0 m/s 2. 9.0 m/s

3. 15 m/s 4. 36 m/s

Question 7

A hiker is approaching a sheer cliff wall.

She yodels, and hears the echo of her yodel after 3.1 s.

How far is she from the cliff?

1. 310 m 2. 530 m

3. 1100 m 4. 3100 m

Question 8

What is the wavelength of a sound wave with a frequency of 500 Hz ?

1. 0.69 m. 2. 0.75 m.

3. 1.5 m. 4. 1.8 m.

Question 9

A police car has an 800-Hz siren. It is traveling at 35.0 m/s towards an observer.

What is the perceived frequency of the siren by this observer?

1. 725 Hz 2. 800 Hz

3. 882 Hz 4. 891 Hz

Question 10

At a distance of 16.0 m from a sound source the intensity level is 70.0 dB.

What is the intensity of this sound in W/m2

?

1. 10-16 W/m2

2. 10-12 W/m2

3. 10-7 W/m2

4. 10-5 W/m2

Explanation / Answer

6) 4) 36m/s

v = lamda/T = 3/83*10^-3 = 36.1 m/s

7) 2)530m

2d = v*t ===> d = v*t/2 = 340*3.1/2 = 527 m


8) 1)0.69 m

v = lamda*f ==> lamda = v/f = 340/500 = 0.68 m

9) 3)882 Hz

f' = 800*(340+35/340) = 882 Hz

10) 2)10^-12 W/m^2

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