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Physics

Assertion (A) : Two persons on the surface of moon can not talk to each other.

Reason (R) : The speed of sound decreases with the decrease in temperature.

  1. both A and R are true and R is the correct explanation of A
  2. both A and R are true and R is not the correct explanation of A
  3. assertion is false but reason is true
  4. assertion is true but reason is false

Sound

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Answer

both A and R are true and R is not the correct explanation of A

Explanation

Assertion (A) is true because sound requires a material medium so sound cannot travel in vacuum and since on the moon, there is no medium, therefore, one can not hear the sound produced by others.

Reason (R) is true because with the decrease in temperature, the density of gas increases and consequently the speed of sound decreases and vice versa. In fact, the speed of sound is directly proportional to the square root of temperature of the medium i.e., V ∝ √T where T is the temperature of the gas on the Kelvin scale.

While it's true that sound travels slower at lower temperature, this is not the reason why people can't talk on the Moon so, here reason does not justify the assertion.

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