The speed of sound v in air is approximately 331.4 m/s + 0.6T The speed of light c is 300, 000 km/sec which means it travels from one place to another on Earth more or less instantaneously . Let's say on a cool night (air temperature 10° Celsius ) you see lightning flash and then hear the thunder rumble five seconds later . How far away in km) did the lightning strike ?

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.