A. Radio waves
B. infrared rays
C. Visible light
D. Gamma rays

Correct Answer:

Option B – infrared rays

Explanation

Infrared rays are easily detected by special photographic films and it can be used for taking picture in haze

SEE ALSO  A ship travelling towards a cliff receives the echo of its whistle after 3.5 seconds. A short while later, it receives the echo after 2.5 seconds. If the speed of sound in air under the prevalling condition is 250ms -1, how much closer is the ship to the cliff?

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