Question

Bats detect obstacles on their path by receiving the reflected _________.
1. electro-magnetic waves
2. ultrasonic waves
3. radio waves
4. infrasonic waves

Answer 1

Correct Answer - Option 2 : ultrasonic waves

CONCEPT:

• Sound waves are longitudinal mechanical waves and frequency can be defined as the number of wave cycles happening in one sec.
• The types of sound waves whose frequency is higher than the upper audible limit of human hearing are called as Ultrasound/Ultrasonic wave.
• Ultrasonic waves or Ultrasound waves: The sound frequency above 20,000Hz is known as ultrasonic waves. Humans cannot detect it too.
• Examples: Bat produce Ultrasonic waves.

EXPLANATION:

• As the bats produce Ultrasonic waves. When the ultrasonic wave produced by the bats strike with the obstacle/food of the bats then it come back at-bats. Therefore option 2 is correct.
• Then bats run along in the direction of that obstacle and catch the food. 
• Bats can’t create the waves like infrared, radio waves and microwaves and they can’t detect it too.