Which one of the following requires no medium?
Correct answer: C. Gamma rays
- A. Beta rays
- B. Alpha rays
- C. Gamma rays
- D. All of these
Explanation
Out of all these, Gamma rays are an example of electromagnetic waves, which require NO medium to travel and propagate from one place to the other or even through a vacuum.On the other hand, mechanical waves require a medium to travel and propagate from one place to the other and can NOT pass through the vacuum. Examples of mechanical waves are sound waves, alpha rays, beta rays, etc.The picture attached represents the 'Electromagnetic Spectrum', of which 'Gamma Rays' are a part of.
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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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