Question

question 4 of 10

why do tv transmissions typically require a direct line of sight to the transmitter?

long wavelengths

low frequency

high energy levels

very short wavelengths

Explanation:

Analyze wave diffraction behavior

Diffraction is the bending of waves around obstacles.
Significant diffraction occurs when wavelength matches obstacle size.

Compare wavelengths of signals

AM radio uses very long wavelengths.
These waves easily diffract around hills and buildings.
TV signals use much higher frequencies.
Higher frequencies mean very short wavelengths.

Relate wavelength to line of sight

Short wavelengths do not diffract around obstacles.
They travel primarily in straight lines.
Therefore, they require a direct line of sight.

Answer:

• Long wavelengths
• Low frequency
• High energy levels
• Very short wavelengths (Correct answer)