Advertisements
Advertisements
Question
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.)
Advertisements
Solution
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
RELATED QUESTIONS
Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen, why?
Write true or false for a given statement.
Sound can travel in a vacuum.
Describe an experiment to show that sound can travel in water.
Write the approximate speed of sound in water .
Can sound travel through solids and liquids ? In which of these two does it travel faster ?
Which of the following travels slowest in air and which one fastest? Supersonic aircraft, Light, Sound
What is the time-period of a tuning fork whose frequency is 200 Hz?
A cricket ball is seen to hit the bat first and the sound of hitting is heard a little later. Why?
Fill in the blanks with suitable words .
Wave speed in metres per second equals frequency in ............ multiplied by ..................... in ..................
The incidence of ______ in daily life shows that the velocity of sound is less than the velocity of light.
Sunil is standing between two walls. The wall closest to him is at a distance of 660 m. If he shouts, he hears the first echo after 4 s and another after another 2 seconds.
- What is the velocity of sound in air?
- What is the distance between the two walls?
The velocity of sound in solid is ______ than the velocity of sound in air.
The velocity of sound is independent of temperature.
The Velocity of sound is high in gases than liquids.
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)
The thunder of cloud is heard 9.8 seconds later than the flash of lightning. If the speed of sound in air is 330 ms–1, what will be the height of the cloud?
Sound travels faster in ______ and slower in ______.
The speed of sound in a gaseous medium depends on the nature of the gas.
Numerical problems:
Two persons are at opposite ends of a steel rod. One strikes the end of the rod with a stone. Find the ratio of time taken by the sound wave in the air and in steel to reach the second person. (Sound of speed in steel = 5960 ms-1, Sound of speed in air = 344 ms-1).
Numerical problems:
A Sound wave travels at a speed of 344 ms-1. If the wavelength is 1.5 cm, what is the frequency of the Wave? Will it be audible?
