Q: What is the frequency of a wave that has a period of 40 seconds?

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Frequency = 1 / (period) = 1/.4 = 2.5 Hz

f = 1/t = 1/0.025 = 40 Hz

The period of a simple pendulum of length 20cm took 120 seconds to complete 40 oscillation is 0.9.

It seems you are talking about radio waves. The wavelength (40 m) multiplied by the frequency (7 million / second) must equal the speed of light (300 million meters/second). It seems that in this example numbers, either the wavelength or the frequency, or both, are not expressed with a great accuracy. For example, if 40 meters is exact, the frequency would be close to 7.5 MHz.

1,000,000 seconds = 277:40:40 277 hours , 40 minutes and 40 seconds

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Frequency = 1 / (period) = 1/.4 = 2.5 Hz

f = 1/t = 1/0.025 = 40 Hz

It is 5 Hz.

The speed of a wave is equal to the product of wavelength x frequency. Just convert everything to standard units (wavelength to meters, frequency to hertz), multiply both, and you'll get the result, also in standard units (meters / second).

1 pulse every 40 microseconds is equal to a frequency of 25,000 hertz

12 minutes and 40 seconds

40 Hz

Divide the speed by the wavelength.

The period of a simple pendulum of length 20cm took 120 seconds to complete 40 oscillation is 0.9.

First of all there is no definition of retangular wave. Maybe your retangular is my square wave. and the answer is inconclusive unless you specify the 40% level.

10*4 = 40 metres per second

It seems you are talking about radio waves. The wavelength (40 m) multiplied by the frequency (7 million / second) must equal the speed of light (300 million meters/second). It seems that in this example numbers, either the wavelength or the frequency, or both, are not expressed with a great accuracy. For example, if 40 meters is exact, the frequency would be close to 7.5 MHz.