Advertisements
Advertisements
प्रश्न
The human ear can detect continuous sounds in the frequency range from 20 Hz to 20,000 Hz. Assuming that the speed of sound in air is 330 m s−1 for all frequencies, calculate the wavelengths corresponding to the given extreme frequencies of the audible range.
Advertisements
उत्तर
The audible range of hearing for a normal human ear is 20 Hz to 20,000 Hz.
Speed of sound in air, v = 330 m s−1
Speed, wavelength and frequency are related as
v = nλ
`:. lambda = v/n`
nlower = 20 Hz
nupper = 20,000 Hz
`:. lambda_"lower" = v/(n_"lower")`
= `330/20`
= 16.5 m
Similarly, `lambda_"upper" = v/n_"upper"`
= `330/20000`
= 0.0165 m
APPEARS IN
संबंधित प्रश्न
How is the frequency of a stretched string related to its length?
The displacement distance graph of two sound waves A and B, travelling in a medium, are as shown in the diagram below.
Study the two sound waves and compare their:
- Amplitudes
- Wavelengths
State the use of echo by a bat, dolphin and fisherman.
What is the shape of a soundboard kept behind the speaker on the stage of a big hall ?
Write the approximate value of the speed of sound in iron.
A cork piece is floating on the surface of the water in a pond. A piece of pebble is dropped into the water. What will be your observation?
When a sound is made from a distance of 18 m, in front of a tall building, it is found to get repeated again. Which phenomenon is associated with this observation? Give a brief explanation of this phenomenon?
Why is an echo not heard when the distance between the source of sound and reflection body is less than 10 m?
In what respect does waveforms of noise and a musical note differ. Draw diagrams to illustrate your answer.
Match the following:
| 1. | Stethoscope | a. | Repeated reflections |
| 2. | Echogram | b. | Multiple reflections |
| 3. | SONAR | c. | Ultrasonic waves |
| 4. | Reverberation | d. | Speed of underwater objects |
