The radio frequency to contact Earth was 2287,5 MHz. What is the wavelength of the radio waves? And the time in (s) for the signal to reach the earth the distance of the moon from earth is 3,84*10^8?

To calculate the wavelength of the radio waves, we can use the formula:

Wavelength = speed of light / frequency

The speed of light is approximately 3 x 10^8 m/s.

Wavelength = 3 x 10^8 / 2287.5 x 10^6
Wavelength = 131.1 meters

To calculate the time it takes for the signal to reach Earth from the Moon, we can use the formula:

Time = distance / speed of light

Distance = 3.84 x 10^8 meters

Time = 3.84 x 10^8 / 3 x 10^8
Time = 1.28 seconds

Therefore, the wavelength of the radio waves is 131.1 meters and it takes approximately 1.28 seconds for the signal to reach Earth from the Moon.