Advertisements
Advertisements
Question
What are ultrasonic?
Advertisements
Solution
Ultrasonic are sounds having frequency higher that 20 KHz and not audible to the human being.
APPEARS IN
RELATED QUESTIONS
The sketches I to IV in following Figure show sound waves, all formed in the same time interval.
 |
 |
| I | II |
 |
 |
| III | IV |
Which diagram shows
- a note from a musical instrument
- a soft (or feeble) note,
- a bass (low frequency) note.
A microphone is connected to the Y-input of a C.R.O Three different sounds are made in turn in front of the microphone. Their traces (a), (b) and (c) produces on the screen are shown in following figure.
 |
 |
 |
| (a) | (b) | (c) |
- Which trace is due to the loudest sound? Give reason for your answer.
- Which trace is due for the sound with the lowest pitch? Explain your answer.
Complete the following sentences:
An average person can hear sound of frequencies in the range ______ to _________.
Sonar makes use of :
The sonic boom of an aircraft has a time period of 0.00005s. Calculate the frequency of sound produced.
Ultraviolet radiation has a wavelength of 300Å. If the velocity of the electromagnetic wave is 3 × 108 ms-1. Calculate:
- frequency
- time period.
What are ultrasonic? State and explain two applications of ultrasounds.
What are infrasonic and ultrasonic sounds?
Is the energy carried by the ultrasound very high or very low?
1 hertz is equal to
