The frequency of the radio wave is:

The wavelength of an electromagnetic wave is related to its frequency by the relationship

where c is the speed of light and f the frequency. Plugging numbers into the equation, we find

and this is the wavelength of the radio waves in the problem.
Answer:
3
Explanation:
it's too because on you measuring mass of something
False. reaction time would be lapse of time between external stimuli and muscular movement