Which one of the following waves needs a medium to travel?
Correct answer: C. None of these
- A. X rays
- B. Gamma rays
- C. None of these
- D. Beta rays
Explanation
X-rays and gamma rays are electromagnetic waves, so they can travel in a vacuum. Beta rays are actually fast-moving electrons (particles), not waves, and they also do not require a medium. So, none of the given options need a medium to travel.
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About Alternating Current
Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
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