Explanation

Explanation

A mosquito produces a high-frequency sound, while a lion produces a low-frequency roar.

The difference in frequency is what makes their sounds so distinct to our ears.

Higher frequencies sound more like buzzing or whines, while lower frequencies sound deeper and more powerful.

Explanation

Explanation

In longitudinal waves, the particles of the medium (air molecules, in this case) vibrate back and forth in the same direction as the wave is moving.

This is how sound propagates through gases like air.

Laplace also corrected Newton's theory by including the effect of adiabatic compression, improving the accuracy of the speed of sound calculation in air.

Explanation

1. Stone dropped from 400 ft tower — Impact sound heard time:

• What happens: Stone falls, hits water, sound travels back up.

• Key points:

  • Time to fall = $sqrt{frac{2h}{g}} = sqrt{frac{2 times 400}{32}} = 5 text{ seconds}$

  • Time for sound to travel up = $frac{400}{1120} approx 0.36 text{ seconds}$
    

• Total time: Around $5+0.36=5.36$ seconds (approximate).

Explanation

Hakim Shaibani was a key lieutenant under Muhammad bin Qasim during the conquest of Sindh in the early 8th century.

 Muhammad bin Qasim sent his trusted commander Abu Hakim Shaibani toward Kanauj 

Additional information 

Muhammad ibn Qasim led the Muslim conquest of Sindh

From Raja Dahir in the battle of Aror.

He was the first Muslim to have successfully captured Hindu territories

And initiated the early Islamic India in 712 AD.

Explanation

Reverberation time is mainly influenced by:

• The volume of the room

• The absorptive properties of surfaces

• The number of sound-absorbing objects or people

While absorption can vary slightly with frequency, the frequency itself is not a primary controlling factor of reverberation time.

Explanation

A hydrophone is an instrument designed to detect and record sound underwater.

It's essentially the underwater equivalent of a microphone and is commonly used in:

• Marine biology (e.g., studying whale calls or dolphin clicks)

• Submarine and naval operations (e.g., detecting other submarines or ships)

• Environmental monitoring (e.g., measuring underwater noise pollution)

• Underwater research (e.g., studying seismic activity or underwater volcanic eruptions)

Explanation

The velocity of sound is calculated using the formula:

Velocity=Frequency×Wavelength

Given:

Frequency = 300 Hz

Wavelength = 4 ft

Velocity=300×4=1200 ft/sec