Stories abound of people who receive radio signals in fillin

Stories abound of people who receive radio signals in fillings in their teeth. Suppose you have one filling that is 2.5 mm (0.0025 m) long that acts as a radio antenna. That is, it is equal in length to one-half the wavelength. What frequency do you receive?

Solution

Answer:

We have given, lemmda = 2 *2.5 *10^-3 = 5 * 10^3m

Now, f = c / lemda = ( 3 *10^8) / (5 * 10^3m) = 6 *10^10 Hz.

Thus the frequency we can recieve = f = 60Hz