Physics
Assertion (A) : Sound waves cannot travel through vacuum.
Reason (R) : Sound travels in the form of longitudinal waves.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false
Sound
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Answer
both A and R are true and R is the correct explanation of A
Explanation
Assertion (A) is true because sound needs a material medium (solid, liquid, or gas) to propagate and in vacuum, there are no particles to transmit the vibrations — so sound cannot travel.
Reason (R) is true because in most media (especially air), sound propagates as longitudinal waves, where particles oscillate parallel to the direction of wave propagation.
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Assertion (A) : The speed of sound is maximum in gases when compared with speed in solids.
Reason (R) : The speed of sound in a medium depends on the density of medium.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
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Reason (R) : The increase of moisture in air tends to decrease the density of air.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false