Which rays need medium to travel?
Correct answer: D. No radiation needs medium to travel
- A. X-rays
- B. Beta rays
- C. Gamma rays
- D. No radiation needs medium to travel
Explanation
Option D is correct because radiation does not need a physical medium to radiate. These radiate in the form of electromagnetic waves. For example, the heat radiated from the sun in space to the earth in the form of an electromagnetic wave and thus does not require a medium to propagate.
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About Electromagnetic Waves
Electromagnetic waves consist of mutually perpendicular, oscillating electric and magnetic fields that also remain perpendicular to the direction of propagation. They travel through vacuum at the speed of light and include radio waves, microwaves, infrared, visible, ultraviolet, X-rays and gamma rays. Unlike mechanical waves, they do not require a material medium.
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