Advertisements
Advertisements
प्रश्न
Explain why, the ceilings of concert halls are curved.
Advertisements
उत्तर
The ceilings of concert halls are curved so that multiple reflections of sound waves can take place.
The parabolic surfaces are used to focus the sound at a particular point. Hence sound will be louder.
APPEARS IN
संबंधित प्रश्न
Why are the ceilings of concert halls curved?
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 ms1 for all frequencies; calculate the wavelengths corresponding to the given extreme frequencies of the audible range
A certain sound has a frequency of 256 hertz and a wavelength of 1.3 m.
1) Calculate the speed with which this sound travels
2) What difference would be felt by a listener between the above sound and another sound traveling at the same speed, but of wavelength 2.6 m?
Define wave velocity term in relation to a wave.
State two factors on which the speed of a wave travelling in a medium depends.
State the use of echo by a bat, dolphin and fisherman.
Name the waves which are used in sonar to find the depth of a sea. Give one reason for their use.
What adjustments would you make for tuning a stringed instrument for it to emit a note of a desired frequency?
What is a megaphone ? Name the principle on which a megaphone works.
What is a stethoscope ? Name the principle on which a stethoscope works.
Draw a labelled diagram to show the multiple reflections of sound in a part of the stethoscope tube.
State two factors on which the natural frequency of a body depends.
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?
Name the type of waves that are used for sound ranging. Why are radio waves not audible to us?
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?
