Frequency = 1 / (period) = 1/.4 = 2.5 Hz
f = 1/t = 1/0.025 = 40 Hz
It is 5 Hz.
4 seconds/ 40 time = 1/10 of a second.
The difference Is 5 minutes 40 seconds.
That would also depends on the speed of the wave. The relationship is: speed = frequency x wavelength.
The speed c = 40 meters per second and the frequency f = 120 Hz. The wavelength lambda = c / f. Lambda = 40 / 120 = 0.3333333333 meters.
40 Hz
40 Hz
The period of a simple pendulum of length 20cm took 120 seconds to complete 40 oscillation is 0.9.
Divide the speed by the wavelength.
There are 8 x 60 seconds in 8 minutes = 480 seconds, so the answer is 40 divided by 480 = 0.08333 Hertz (0.08333 cycles per second).