Radio Waves — Prelims Questions

Which of the following statements about radio waves is INCORRECT?

A radio station broadcasts at a frequency of $98.3,\text{MHz}$. What is the wavelength of these radio waves in meters? (Speed of light $c = 3 \times 10^8,\text{m/s}$)

Which mode of radio wave propagation is primarily used for FM radio broadcasting and cellular communication?

A transmitting antenna has a height of $80,\text{m}$ and a receiving antenna has a height of $20,\text{m}$. Assuming the radius of Earth $R = 6.4 \times 10^6,\text{m}$, what is the maximum line-of-sight distance for space wave propagation between them?

Which of the following phenomena is responsible for the long-distance propagation of shortwave radio signals?

If an LC circuit is used to generate radio waves, which of the following changes would result in the generation of radio waves with a higher frequency?