Advertisements
Advertisements
प्रश्न
What are hearing aids?
Advertisements
उत्तर
A hearing aid is a device which increases the loudness and intensity of the incoming sound.
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.
Which has the higher frequency - ultrasonic sound or infrasonic sound?
Complete the following sentences:
An average person can hear sound of frequencies in the range ______ to _________.
What is ultrasound?
The properties of ultrasound that make it useful are
How do bats locate their prey during a flight?
What is Galton’s whistle? To what use is it put?
Ultraviolet radiation has a wavelength of 300Å. If the velocity of the electromagnetic wave is 3 × 108 ms-1. Calculate:
- frequency
- time period.
Does SONAR make use of infrasonic sound?
Ultrasound has frequency of vibration
