MCQ practice · SSC Physics Board questions · Chapter 7: Waves and Sound
For which of these waves can only the reaction be felt?
Think it through first, then pick an option.
- a gravity web
- b sound wave
- c electromagnetic wave
- d wave function
Answer and explanation
Correct answer: d wave function
A wave function is not a real wave but a mathematical quantity describing a particle in quantum mechanics. You cannot feel it directly, only measure its effects.
Why the other options are wrong
- a gravity web: Gravity waves are real waves, but so weak that only special instruments catch them. The intended answer here is the wave function, the one that is only a mathematical quantity known by its effects.
- b sound wave: Sound is a mechanical wave. The ear hears it directly, not only its effect.
- c electromagnetic wave: An electromagnetic wave is a real wave. Light is one, and the eye sees it directly.
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