Integrated Coordinated Science for the 21st Century
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Answers
Physics To Go
- a) The string is vibrating, and the air in the pipe is also vibrating.
b) The string vibration is transverse, and the air vibration is compressional.
- a - b) See drawings on page 203.
c) If you double the length of the straw, you cut the frequency it produces in half. When both ends are open, the frequency will be twice as high as when one end is closed.
d) There should be good agreement.
- a) 11 m
b) See drawings on page 203.
c) 4 X 11 m = 44 m
d) The speed of sound is independent of the wavelength. But the product of wavelength and frequency equals speed, so this product is a constant. Thus, a longer wavelength means a lower frequency.
- a) λ = 4 X 3 m = 12 m
b) f = v/λ = 340/12 Hz = 28 Hz
c) 2 X 3 m = 6 m
d) f = 340/6 Hz = 57 Hz
- The frequency is three times higher.
- a) diffraction
b) As an example see diagram on page 204.
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