Signal from a remote control to the device operated by it, travels with the speed of:
Correct answer: D. Light
- A. Sound
- B. Supersonic
- C. Ultrasonic
- D. Light
Explanation
The correct answer is that the signal from a remote control travels at the speed of light. This is because remote controls typically use infrared radiation, which is a form of light. Infrared radiation is part of the electromagnetic spectrum and travels at the same speed as light, approximately 299,792 kilometers per second in a vacuum.Sound and ultrasonic waves travel much slower than light, at about 340 meters per second in air. Supersonic refers to speeds faster than sound but not approaching the speed of light. Hence, these options are incorrect for describing how remote control signals travel.
This question appeared on the ETEA MDCAT 2016 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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