Final answer:
To find the wavelength for a 920 kHz radio broadcast, use the speed of light and frequency with the formula λ = c/f. After plugging in the given values and calculating, the wavelength is found to be 326 meters (Option A).
Step-by-step explanation:
To find the wavelength used by a radio station broadcasting at a frequency of 920 kHz, we use the formula for the relationship between wavelength (λ), frequency (f), and the speed of light (c).
The formula is c =λ * f, where c is the speed of light in a vacuum (3.00 * 108 m/s), λ is the wavelength, and f is the frequency.
To solve for wavelength, rearrange the formula to λ = c / f. Substituting the given values, we get:
λ = (3.00 * 108 m/s) / (920 * 103 Hz)
λ = 3.00 * 108 / 9.20 * 105
λ = 3.26 * 102 m
Therefore, the wavelength used by the radio station is 326 meters, which corresponds to answer choice A.