Question

Which of the following is not possible?

• A. Man knocks at one end of a long metal pipe and another man hears the knock at the other end.
• B. An explosion is heard by an astronaut when a laser beam hits an enemy fighter in space.
• C. A whale can hear the voice of her child in deep sea.
• D. Mole hears another mole underground.

Answer 1

The correct option is B

An explosion is heard by an astronaut when a laser beam hits an enemy fighter in space.

Sound needs a medium to transmit. The medium can be solid, liquid or gas. Sound cannot transmit through vacuum because there are no vibrating particles to pass on the energy. It is impossible for sound to be transmitted space.