Advertisements
Advertisements
प्रश्न
Rohan conducted experiments on echo in different media. He observed that a minimum distance of 'x' meters is required for the echo to be heard in oxygen and 'y' meters in benzene. Compare 'x' and 'y'. Justify your answer.
Speed of sound in oxygen: 340 ms-1
Speed of sound in benzene: 200 ms-1
Advertisements
उत्तर
Since, d = `(vt)/2`
Where, d is the distance between the source of sound and the reflecting surface.
t be the time after which echo is heard
v is the speed of the sound
t = 0.1 sec for echo, It is constant for both
∴ d α v
Hence, `v_"oxygen"> v_"benzene"`
Hence, x > y
APPEARS IN
संबंधित प्रश्न
Fill in the blank with suitable word :
An echo is simply a ................... sound.
On which day, a hot day or a cold day, an echo is heard sooner ? Give reason for your answer.
Why are the ceilings of concert halls made curved ? Draw a labelled diagram to illustrate your answer.
Name any two objects which are good reflectors of sound.
A man standing 825 metres away from a cliff (steep rock) fires a gun. After how long will he hear its echo ? Speed of sound in air is 330 m/s.
A man is kidnapped, blindfolded and imprisoned in a big room. How could the man tell if he was in : a bare room
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.
How can you calculate the speed of sound using echo?
______ is an image obtained by the use of reflected ultrasonic waves.
