Question

a large jet flying overhead is low enough so that a man on the ground can hear its engines. the man sees the jet before he hears the engines because
a his sight is stronger than his hearing.
b his hearing is stronger than his sight.
c the speed of light is faster than the speed of sound.
d the speed of sound is faster than the speed of light.

Explanation:

The man sees the jet before hearing its engines because light (which allows seeing) travels faster than sound (which allows hearing). The speed of light in a vacuum is about \(3\times10^{8}\) m/s, while the speed of sound in air is about 343 m/s. Options A and B are incorrect as they relate to the strength of senses, not the physical speeds of light and sound. Option D is factually wrong as sound is slower than light. So the correct reason is the speed of light being faster than sound.

Answer:

C. the speed of light is faster than the speed of sound.