To calculate the frequency of radio waves detected by an aerial, we can use the formula:
frequency = speed of light / wavelength
Given that the speed of light (C) is 300,000,000 m/s and the aerial length is a quarter wavelength, we can find the wavelength as follows:
wavelength = 4 * aerial length
Substituting the values:
wavelength = 4 * 1.5m = 6m
Now, we can calculate the frequency:
frequency = 300,000,000 m/s / 6m = 50,000,000 Hz
Therefore, the frequency of the radio waves detected by the 1.5m long aerial is 50,000,000 Hz or 50 MHz.