# Sound Waves Homework

#### ilovep6

Greetings to everyone! I just need help for my homework. Because I am confused on this given problem:

In foggy weather a lighthouse sends sound signals simultaneously underwater and through the air 10 C. A vessel is 1000 m from the lighthouse. How much later does one signal arrive than the other? Ans. 2.27s

This problem came from Webber and Manning college physics. Any solutions are appreciated. Thank You very much.

Best regards,
Mark

#### topsquark

Forum Staff
What is the speed of sound in air? What is the speed of sound in water?

-Dan

#### Woody

Sound waves are transmitted via (small) distortions of the material the sound is travelling through.
(Compressions and Rarefactions)

The intermolecular forces alter how much resistance a material puts up against these distortions
which in turn affects the speed at which the sound travels through that material.

The intermolecular forces are stronger in water than in air
which causes sound to travel noticeably faster through water than through air.