Advertisements
Advertisements
प्रश्न
Name the device which is used to address a small gathering of people.
उत्तर
Megaphone or bullhorn is a device that is used to address a small gathering of people.
APPEARS IN
संबंधित प्रश्न
Does sound follow the same laws of reflection as light does? Explain.
When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day?
What is meant by an echo?
Which of the following statement best describes frequency?
Fill in the blank with suitable word :
An echo is simply a ................... sound.
Why are the ceilings of concert halls made curved ? Draw a labelled diagram to illustrate your answer.
State the laws of reflection of sound.
An echo-sounder in a trawler (fishing boat) receives an echo from a shoal of fish 0.4 s after it was sent. If the speed of sound in water is 1500 m/s, how deep is the shoal ?
When sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound remain the same. Do you hear an echo sound on a hotter day? Justify your answer.
Assertion: The sound which we hear again is called Echo.
Reason: The sensation of sound (Echo) persists in our brain for about 1 s.
