Option 1 states that sound travels at a speed lower than the speed of light. This statement is correct. The speed of light is much faster than the speed of sound. Sound waves travel through a medium, such as air, and their speed depends on the properties of the medium. In general, sound travels at a much slower speed compared to light.

Option 2 states that sound waves are transverse waves. This statement is NOT correct. Sound waves are actually longitudinal waves. In a longitudinal wave, the particles of the medium vibrate parallel to the direction of wave propagation. This is different from transverse waves, where the particles vibrate perpendicular to the direction of wave propagation.

Option 3 states that sound waves are longitudinal waves. This statement is correct. As mentioned earlier, sound waves are indeed longitudinal waves where the particles of the medium vibrate parallel to the direction of wave propagation.

Option 4 states that sound travels faster in moist air than in dry air. This statement is incorrect. Sound waves actually travel faster in dry air than in moist air. This is because dry air is less dense than moist air, allowing sound waves to propagate more quickly.

In conclusion, the NOT correct statement about sound is option 2, which incorrectly states that sound waves are transverse