Physics
Grade-7
Easy
Question
___________ waves can be observed.
- Electromagnetic
- Sound
- Surface
- All
Hint:
Surface
The correct answer is: Surface
- We can observe or see surface waves to some extent but cannot see sound waves unless we build a setup to do so but not naturally.
- Electromagnetic waves do not move through molecules. Electromagnetic waves can so travel through air, solid objects, and even space.
- This is how astronauts on spacewalks communicate using radios. Electromagnetic waves include radio waves.
- Electromagnetic waves are types of energy that are invisible and flow across the universe.
- However, some of the effects of this energy are visible. The light that we see is a component of the electromagnetic spectrum.
- Surface waves are similar to sea waves and are what we see and feel. Rayleigh waves, one form of surface wave, give the impression that the earth is rolling. The other sort of surface wave, Love waves or L-waves, gives the impression that the ground is moving.
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