Advertisements
Advertisements
प्रश्न
State the main components of a hearing aid.
Advertisements
उत्तर
The main components of hearing aid are microphone , amplifier and earphone.
APPEARS IN
संबंधित प्रश्न
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.
Can you hear the sound produced due to vibrations of a seconds pendulum? Give reasons.
State two applications of ultrasound.
The properties of ultrasound that make it useful are
What do you understand by the term sonic vibrations? State the range of sonic vibrations for the human ear.
How do bats locate their prey during a flight?
What is Galton’s whistle? To what use is it put?
An electromagnetic wave has a time period of 4 × 10-8 s. Calculate its frequency in MHz.
What are ultrasonic?
Is the energy carried by the ultrasound very high or very low?
