science
Grade-7
Easy
Question
When light traveling in water enters the air, its speed becomes ___ m/s.
- 3 x 108
- 2 x 108
- 1 x 108
- 1.5 x 108
Hint:
The speed of light increases when it goes from denser medium to rarer medium.
The correct answer is: 3 x 108
The correct answer is a) 3 x 108 . Light travels faster in air than other mediums which are denser. The speed of light in water is less than that of air as water is denser than air. This is because the molecules of water are closer in water than in air. Light travels the fastest in vacuum then in air and then in other mediums.
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