Sixty complete waves pass a particular point in 4s. lf the distance between three successive troughs of the waves is 15m, calculate the speed of the waves,
300.0ms-1
225.0ms-1
112.5ms-1
75.0ms-1
16.0ms-1
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To calculate the speed of the waves, we need to find the wavelength and the frequency.
Frequency (f) = Number of waves / Time
= 60 waves / 4 s
= 15 Hz
Wavelength (λ) = Distance between 3 successive troughs / 2
= 15 m / 2
= 7.5 m
Speed (v) = Frequency × Wavelength
= 15 Hz × 7.5 m
= 112.5 m/s
The correct answer is C. 112.5 m/s.
What is the frequency of a radio wave of wavelength 150m if the velocity of radio waves in free space is 3 x 108ms−1? A. 4.5 x 1010Hz. B. 5x 109Hz. C. 4.5 x 108Hz. D. 2 x 107Hz. E. 2 x 106Hz
a stationary wave in a spring is fixed at both ends. If the frequency of the wave is 256HZ and the distance N1N2 equals to 1.5m, calculate the speed of the wave.
F = revolution/time
F = 60/4 = 15
wavelength = distance bw A successive trough.
wavelength = 15/3 = 5
WAVESPEED = FREQUENCY * WAVELENGTH.
WAVESPEED= 15 * 5 = 75
answer is D
