Answer to Question #291163 in Optics for Mark

Question

a lightning flash was seen 2 seconds before the clap of thunder. If the temperature was 25°C, how far away did the lightning occur

Answer 1

Solution:

At 25 °C, the speed of sound in air is about 343 meters per second.

When $t= 2 \ s, d = s \times t = 343 \times 2 = 686\ m.$