Advertisements
Advertisements
प्रश्न
What is the other name of a loud-hailer ?
Advertisements
उत्तर
Megaphone or bullhorn is also called as loudhailer.
APPEARS IN
संबंधित प्रश्न
Name three devices which work on the reflection of sound.
Fill in the blank with suitable word :
An echo is simply a ................... sound.
Why do we hear more clearly in a room with curtains than in a room without curtains ?
The speed of sound in water is 1500 metres per second. How far away from an under-sea rock should a deep sea diver be so that he can hear his own echo ?
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 ?
Explain by giving a scientific reason.
We cannot hear the echo produced in a classroom.
What is an echo?
What are the medical applications of echo?
How can you calculate the speed of sound using echo?
______ allows bats to navigate through dark caves and find insects for food.
