Question

Which among the following statements are correct about the sound waves?

1. Compression and rarefaction involve changes in density and pressure.
2. Sound will become audible if a string is set into vibrations with a time period of 0.04 s on the surface of the moon.
3. Sound travels slower than light.
4. As the length of the vibrating body increases, the frequency increases.

• A. Both 1 and 4
• B. Both 2 and 3
• C. Both 1 and 3
• D. Both 2 and 4

Answer 1

The correct option is C Both 1 and 3