Advertisements
Advertisements
प्रश्न
Nita heard the sound of lightning after 4 seconds of seeing it. What was the distance of the lightning from her?
(The velocity of sound in air is 340 m/s.)
उत्तर
Given:
- Speed of sound in air (v) = 340 m/s,
- Time (T) = 4 second
Find: Distance (λ)
Formula: v = `lambda/"T"`
Calculations:
According to formula,
`340 = lambda/4`
λ = 340 × 4
λ = 1360 m
The distance of lightning flash from Nita will be 1360 m.
APPEARS IN
संबंधित प्रश्न
A sound wave travels at a speed of 339 m s−1. If its wavelength is 1.5 cm, what is the frequency of the wave? Will it be audible?
Fill in the blank.
Sound travels faster in ________ than in liquids.
Describe an experiment to show that sound can travel in water.
During a thunderstorm, the sound of a thunder is heard after the lightning is seen. Why?
Can sound travel through solids and liquids ? In which of these two does it travel faster ?
What is meant by supersonic speed?
A sound signal of 128 vibrations per second has a wavelength of 2.7 m. Calculate the speed with which the wave travels.
A worker lives at a distance of 1.32 km from the factory. If the speed of sound in air be 330 m/s, how much time will the sound of factory siren take to reach the worker?
Fill in the blanks with suitable words .
Wave speed in metres per second equals frequency in ............ multiplied by ..................... in ..................
Fill in the blank with suitable word :
The speed of sound in a solid is ............... than the speed of sound in air.
If the speed of a wave is 340 m/s and its frequency is 1700 Hz, then λ for this wave in cm will be :
The drawing shows a ship 800 m from a cliff. A gun is fixed on the ship. After 5 seconds the people at the front of the ship hear the sound of the gun again.
(a) What is the name of this effect ?
(b) What happens to the sound at the cliff ?
(c) How far does the sound travel in 5 seconds ?
(d) Calculate the speed of sound.
Hydrogen gas is filled in two identical bottles, A and B, at the same temperature. The mass of hydrogen in the two bottles is 12 gm and 48 gm respectively. In which bottle will sound travel faster? How many times be as fast as the other?
Write the formula for speed of sound in a gas using Laplace correction.
The velocity of sound in solid is ______ than the velocity of sound in air.
A source of sound is travelling with a velocity 40 km/h towards an observer and emits a sound of frequency 2000 Hz. If the velocity of sound is 1220 km/h, then the apparent frequency heard by the observer is _____.
Air temperature in the Rajasthan desert can reach 46°C. What is the velocity of sound in air at that temperature? (V0= 331 ms–1)
Establish the relationship between the speed of sound, its wavelength and frequency. If the velocity of sound in air is 340 m s–1, calculate
(i) wavelength when the frequency is 256 Hz.
(ii) frequency when the wavelength is 0.85 m
Sound travels faster in ______ and slower in ______.
On which factors does the speed of sound in the gaseous medium depend?
