Physics

If an earthquake wave having a wavelength of 13 km caused the ground to vibrate 10 times each minute, what is the speed of the wave?
1.2 km/s
2.2 km/s
220 m/s
22 m/s

If the amplitude in a sound wave is doubled, by what factor does the intensity of the wave increase?
2
1
8
4(my choice)

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  1. period = 60/10 = 6 seconds
    goes 13 km in 6 seconds
    13/6 = 2.2 km/s

    yes, 2^2 = 4

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  2. F = 10vib/min = 10vib/60s = 1/6 vib/s = Freq.
    T = 1/F = 1/(1/6) = 6 s. = Period.
    Wavelength = V*T= 13.
    V * 6 = 13,
    V = 2.2 km/s.

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