# Sound and Light word problem.

1. Apr 25, 2012

### seker

1. The problem statement, all variables and given/known data

Lighting strikes the ground 1.00 km form an observation point. Calculate the delay between seeing the flash and hearing the thunder. (Temperature @ 15⁰C)(Speed of light = 2.99 x10⁸ m/s)

2. Relevant equations

$$v=331+(0.6)T$$

3. The attempt at a solution

Speed of the sounds is = 340 m/s 1,000/340 = 2.94 sec

Speed of the light is $$2.99 x 10^8 m/s$$ $$(1,000) \div (2.99 x10^8) = 3.3 x 10^-5$$

2.94 - 0.000033 = 2.939967 seconds

2. Apr 25, 2012

### Mindscrape

Sure, but basically it's silly to even consider the light time delay because the scale is so small that sound turbulence/reflections will perturb the sound much more than the 3*10^-5 light time delay.