Two astronauts are repairing the arm of a space station together during a spacewalk. Class 9

Two astronauts are repairing the arm of a space station together during a spacewalk. Class 9

Think It Over (Page 184)

Question 1.

Two astronauts are repairing the arm of a space station together during a spacewalk. Can they talk to each other and hear the sounds of metal clanking as they do on the Earth? Class 9

Answer:

No, they cannot hear sounds directly because space is a vacuum and sound requires a medium to travel. They communicate using radio devices in their suits, which transmit signals through electromagnetic waves.

Question 2.

How do most bats use sound to locate their prey in the dark at night? Class 9

Answer:

Bats use echolocation. They emit ultrasonic sounds which reflect off objects and return as echoes. By detecting these echoes, bats can locate the position, distance, and movement of their prey.