Question

The electromagnetic wave of a radio station has a wavelength of 3.5 meters. If the station is located 94 km away from you, how many seconds does it take for the radio waves to reach you?

Answer 1

Ans example, we know that, radio wave is an of electromagnetic wave on radiation, Electromagnetic radiation is also known as light. Gener we su nerally radiation traved at the say that all electromagnetic same speed of light and the value of tigh speed of light (c) is 3x108m/ See in a vacuum . ". The speed of radio wave wave is equal to the speed of light (C) and the value is 3x108m/secin vacuum, Another matter is that the speed of light through air is slightly different respective medium. This is negligeable value know that, for electromagnetic ve in vaccum we Wave speed = freauency X wavelength с a 2x) CS Scanned with CamScanner

In problem given by, wavelength = 3.5 meter, Distance d 94 km 294x103 meter, for and the medium is air. electromagnetic wave, we can say that distance (d) = speed of electromagnetic wave x time (t ie d = ct. 94 x103 - 3x108 3x108xt. 94X103 3 X 108 sec. t = -5 - 31:33 X 10 Sec. t34 - t sec by :: The radio waves taken 31.33x10 reach to me. This time value is small. In smaller unit it will take 313. 3 us. very CS Scanned with CamScanner