電磁波：练习题

Which part of the electromagnetic spectrum is used for both satellite communications and cooking food?

Why are ultraviolet waves, X-rays, and gamma rays considered more hazardous to human body tissue than radio waves?

(HT only) Which of the following is a correct description of how radio waves are generated in a transmitter?

In which of these mediums do electromagnetic waves travel at the same velocity?

Which type of electromagnetic radiation is produced by changes in the nuclei of atoms?

State the property of electromagnetic waves that remains the same for all types when they travel through a vacuum.

(HT only) Explain how radio waves can induce an alternating current in a receiving electrical circuit.

(HT only) Explain how the production of radio waves in a transmitting antenna is related to the oscillations of electrons, and describe what happens when these waves are absorbed by a receiving aerial.