Good Practice Physics Examples

Topics: Wavelength, Sound, Frequency Pages: 2 (517 words) Published: April 22, 2013

1. The period of a wave is 0.0300 seconds. It travels at a velocity of 10.0 m/s. Determine the frequency and the wavelength.

2. A wave having a wavelength of 4.0 meters and an amplitude of 2.5 meters travels a distance of 24 meters in 8.0 seconds. Determine the frequency and the period of the wave.

3. While hiking through a canyon, Noah Formula lets out a scream. An echo (reflection of the scream off a nearby canyon wall) is heard 0.82 seconds after the scream. The speed of the sound wave in air is 342 m/s. Calculate the distance from Noah to the nearby canyon wall.

4. Mac and Tosh are resting on top of the water near the end of the pool when Mac creates a surface wave. The wave travels the length of the pool and back in 25 seconds. The pool is 25 meters long. Determine the speed of the wave.

5. An automatic focus camera is able to focus on objects by use of an ultrasonic sound wave. The camera sends out sound waves that reflect off distant objects and return to the camera. A sensor detects the time it takes for the waves to return and then determines the distance an object is from the camera. The camera lens then focuses at that distance. Now that's a smart camera! In a subsequent life, you might have to be a camera; so try this problem for practice: If a sound wave (speed = 340 m/s) returns to the camera 0.150 seconds after leaving the camera, then how far away is the object?

6. Find the wavelength of a 680-Hz tone in air, where the wave speed is 340 m/s.

7. Imagine a hiker camping in the mountains. Just before going to sleep he yells, “WAKE UP,” and the sound echoes off the nearest mountain, returning 8 h later. How far away is that mountain?

8. Harriet is told by her doctor that her heart rate is 70.0 beats per minute. If Harriet’s average blood flow in the aorta during systole is 1.5 x 10 -2 m/s, what is the wavelength of the waves of blood in Harriet’s aorta,...
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