Physics
Grade-8
Easy
Question
Distance can be measured using ___________ .
- Ultrasound
- Infra sound
- Audible sound
- None
Hint:
Ultrasound
The correct answer is: Ultrasound
- Ultrasound can be used to measure distances between objects.
- By measuring the delay between the transmission of an ultrasound pulse and the return of the echo, distance can be measured.
- So, the correct option is a.
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- The audible frequency range is 20Hz to 20KHz.
- The sound with frequencies less than 20Hz is called infrasound.
