Reflection of waves — task. Science CBSE Homework Assignments, Class 9.

1. The bat hunts it prey by emitting and receiving reflected:

super sonic waves
ultrasonic waves
sonic waves
infrasonic waves

2. A sonic boom is produced in the air when an aircraft flies at a speed:

equal to the speed of sound
more than the speed of sound
less than the speed of sound
climbs vertically

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