Answer: option B. 1.0 × 10⁹ Hz
Explanation:
The speed, s, of a wave, equals the product of its frequency, ν, times its wavelength, λ:
As the question states, the speed of an electromagnetic wave is a constant, c, equal to 3.0 × 10⁸ m/s.
Substituting this constant in the equation for the speed of the wave, you get:
From that equation, you can solve for the frequency to show the inverse realation of frequency and wavelength:
Now, you just have to substitute values and compute:
- ν = c / λ = 3.0 × 10⁸ m/s / 0.3m = 10. × 10⁸ Hz = 1.0 × 10⁹ Hz
