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**Test On Monday...please help!!!**

**1. Homework Statement**

My home is exactly 7.8 km from the Stadium where the 4th of July fireworks are held. The time difference between when I see a flash and when I hear the corresponding sound is 22.4073542085608 s. What is the temperature (in degrees Celsius) of the air?

**2. Homework Equations**

Vsound = sqrt (GAMMA * R * T) / M

**3. The Attempt at a Solution**

T = 20 degrees Celsius + 273 = 293

V = 7800/22.4073542085608 = 348.1 m/s

T = Vsound^2 * M / GAMMA * R

But I don't know M, GAMMA, or R???