Assertion: Sound waves cannot travel in vacuum but light can travel in vacuumReason: Sound waves are longitudinal waves and they cannot be polarised but electromagnetic waves are transverse and they can be polarized. A. Both Assertion and Reason are correct and Reason is the correct explanation for AssertionB. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect

Let's break down the assertion and reason to determine the correct answer.
Assertion:
Sound waves cannot travel in vacuum, but light can travel in vacuum.
• Explanation: Sound is a mechanical wave, which means it requires a medium (such as air, water, or a solid) to propagate. This is because sound waves are the result of the vibration of particles in a medium. In a vacuum, there are no particles to vibrate, so sound cannot propagate in a vacuum.
• On the other hand, light is an electromagnetic wave, which does not require a medium to travel. Electromagnetic waves can propagate through a vacuum, which is why light can travel in space.
Thus, the assertion is correct.
Reason:
Sound waves are longitudinal waves and they cannot be polarized, but electromagnetic waves are transverse and they can be polarized.
• Explanation: Sound waves are indeed longitudinal waves, meaning the particle displacement is parallel to the direction of wave propagation. Longitudinal waves cannot be polarized because polarization refers to the alignment of oscillations in a specific direction, which is only possible for transverse waves (where oscillations are perpendicular to the direction of propagation).
• Electromagnetic waves (like light) are transverse waves, and they can be polarized because their oscillations occur in specific planes (perpendicular to the direction of propagation).
• However, the fact that sound cannot travel in a vacuum is not directly related to whether it is longitudinal or transverse or whether it can be polarized. The key reason sound cannot travel in a vacuum is that it requires a medium to propagate, not its longitudinal nature or its ability to be polarized.
Thus, the reason provided is incorrect in explaining why sound cannot travel in a vacuum.
Conclusion:
The assertion is correct, but the reason is not the correct explanation for the assertion.
The correct answer is: C. Assertion is correct but Reason is incorrect.