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WAEC - Physics (1988 - No. 29)
A source of sounds produces waves in air of wavelength1.65m. If the speed of sound in air is 330ms-1 the period of vibration in seconds is
200
2.0
0.5
0.02
0.005
解释
T = λ/v
T = 1.65/330 = 0.005
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