### Waves 8.9: Additional Problem 4

#### Description

The above simulation shows disturbances on two identical strings (position is in
centimeters and time is in seconds).

#### Question

At t=2.5 seconds which of the following is true
regarding the superposition of the two waves? Start

**Their sum adds up to zero.**
**Their sum adds up to twice the original waves.**
**Their sum is as if only one of the original waves is there.**
**Their sum has a large peak, a depression, and then another large peak.**

#### Answer

Their sum adds up to zero.

#### Reference

See Giancoli-PA: 11-11, Giancoli-SE: 15-6.

#### Credits

Physlet problem authored by Wolfgang Christian and modified by Mario Belloni.

**© 2000 by Prentice-Hall, Inc. A Pearson Company**