A coastal radio station broadcasts electromagnetic waves at a frequency of .

PHYSICS · Multi-part · AP · Physics 2: Algebra-based · Waves Sound and Physical Optics · Waves Sound and Physical Optics

Problem

A coastal radio station broadcasts electromagnetic waves at a frequency of

100\,\text{MHz}

. (i) Calculate the wavelength of the waves in free space. (ii) If the instantaneous electric field amplitude in the signal is

2.0\,\text{V\,m}^{-1}

, determine the corresponding magnetic field amplitude. (iii) Estimate the time taken for these waves to travel a distance of

1500\,\text{km}

over the ocean surface, assuming free-space propagation throughout.