Question

the frequency of electromagnetic wave which has wavelength 50 cm and velocity 3 X 10(power8) m/s is :​

Answer 1

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Wavelength = 30 cm = 0.3 m

Velocity = 3 × 10^8 ms^-1

Now, Through Wave Equation

Velocity = Frequency × Wavelength

3 × 10^8 = f × 0.3

3 × 10^8/ 0.3 = f

1,000,000 = f

Thus, Frequency = 1,000,000 Hz = 1000 khz.