Question

A Fill in the blank spaces by choosing the
correct words from the list given below :
List: ultrasonic, frequency, reflecting, sonar,
amplitude
1. The device used to measure the depth of
sea is called
2. For hearing an echo the minimum distance
between the source of sound and the
body is 17 m.
3. The range of
vibrations is above
20,000 Hz
4. The
of the sound produced by
a vibrating wire decreases, if its length is
increased.​

Answer 1

Answer:

1) sonar

2) reflecting

3) ultrasonic

Answer 2

3. ultrasonic

4.frequency

2. reflecting

1. sonar