The flash of lightning is seen before the thunderstorm is heard. It verifies that

What is the audible range (hearing range) of humans?

The optimum sound level for human beings is-

What is the name of the phenomenon where two waves combine to form a single wave?

What is the name of the part of the ear that collects sound waves?

Two astronauts on the moon are standing 10 m apart. Astronaut A shouts toward Astronaut B and simultaneously flashes a light signal. Which of the following statements is correct?