Question

A. Fill in the blank spaces by choosing the
correct words from the list given below:
List : depth, ultrasonic, amplitude, hertz,
OB.
reflection
1. The maximum displacement of a vibrating
body from its mean position is called its
2. The SI unit of frequency is
3. Dolphins use
sound to locate
their prey.
4. The bouncing off of sound energy, on strik-
ing a hard surface, into the same medium
is called
of sound.
5. Sonar is used to determine the
of ocean bed.​

Answer 1

Answer:

1- amplitude

2- hertz

3- ultrasonic

4- echo

5- depth