Answer :
The frequency of wave is 0.75×10⁶Hz. if 400m is the wavelength of the light wave.
Frequency is characterized as the rate at which current takes a backup way to go each second. It is assessed in hertz (Hz), a worldwide unit of measure where 1 hertz is identical to 1 cycle each second. The opposite of frequency is known as spatial frequency.
We know that for electromagnetic wave ,we have an equation
c=ν × λ
where c is the defined as the speed of wave in any medium,
ν is defined as the frequency of the wave and
λ is defined as the wavelength of the wave.
Since wave is light wave so speed(c) of light =3×10⁸m/sec,
wavelength=400m and frequency=? and
Therefore, 3×10⁸m/sec=v×400
=>v=(3×10⁸)/400
=>v=0.75×10⁶/sec
or=>v=0.75×10⁶Hz.
Hence, frequency of light wave is 0.75×10⁶Hz.
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(Complete question) is:
What is the frequency of wave having wavelength 400m.Assume wave is a light wave?