1. A particle in simple harmonic motion has a frequency of 24Hz. What is the per

Question

1. A particle in simple harmonic motion has a frequency of 24Hz. What is the period of this oscillation?

2. A sound wave has a speed of 340 m/s in air. If this wave produces a tone with a frequency of 1000 Hz, what is its wavelength?

3. A student reading his physics book on a lake dock notices that the distance between two incoming wave crests is about 0.85m, and he then measures the time of arrival between the crests to be 1.7s. What is the approximate speed of the waves?

4. If it takes 18 ms for a bat to receive the ultrasonic sound wave reflected off a mosquito, how far is the mosquito from the bat? Take the speed of sound as 345 m/s.

5. A sonar generator on a submarine produces periodic ultrasonic waves at a frequency of 3.00 MHz. The wavelength of the waves in seawater is 5.09×104 m. When the generator is directed downward, an echo reflected from the ocean floor is received 11.0 s later. How deep is the ocean at that point?

6. Determine the speed of a sound wave in air at a temperature of 25oC.

Explanation / Answer

1)
F = 24 Hz
Time period = 1/f
T = 1/24
T = 0.042 Hz

2)
v = 340 m/s
f = 1000 Hz
v = f *
= v/f
= 340/1000
=   0.34 m

3)
speed of the waves = 0.85/1.7 = 0.5 m/s

4)
Speed = Distance/time
345 = (2*x)/(18 * 10^-3)
x = 3.105 m

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