In vacuum all electromagnetic waves have the same:
Correct answer: A. Speed
- A. Speed
- B. Energy
- C. Frequency
- D. Wavelength
Explanation
All electromagnetic radiations such as microwave, gamma rays or radio waves travel with a speed of light in a vacuum which is equal to 3.0 x 108 meters per second. This is because all massless particles travel with the speed of light. Since light is massless, therefore all particles travel with speed of light. So, the correct answer is option A.
This question appeared on the ETEA MDCAT 2014 paper, which you can sit online with every answer explained.
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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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