Samacheer Kalvi solutions for Science [English] Class 10 SSLC TN Board chapter 5 - Acoustics [Latest edition]

When a sound wave travels through air, the air particles

Velocity of sound in a gaseous medium is 330 ms^–1. If the pressure is increased by 4 times without causing a change in the temperature, the velocity of sound in the gas is

The frequency, which is audible to the human ear is

The velocity of sound in air at a particular temperature is 330 ms^–1. What will be its value when temperature is doubled and the pressure is halved?

If a sound wave travels with a frequency of 1.25 × 10⁴ Hz at 344 ms^–1, the wavelength will be

The sound waves are reflected from an obstacle into the same medium from which they were incident. Which of the following changes?

Velocity of sound in the atmosphere of a planet is 500 ms^–1. The minimum distance between the sources of sound and the obstacle to hear the echo should be

Rapid back and forth motion of a particle about its mean position is called _____.

If the energy in a longitudinal wave travels from south to north, the particles of the medium would be vibrating in _____.

A whistle giving out a sound of frequency 450 Hz, approaches a stationary observer at a speed of 33 ms^–1. The frequency heard by the observer is (speed of sound = 330 ms^–1) ______.

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 _____.

Sound can travel through solids, gases, liquids, and even vacuum.

Waves created by Earth Quake are Infrasonic.

The velocity of sound is independent of temperature.

The Velocity of sound is high in gases than liquids.

Match the following

Mark the correct choice as

1. Assertion: The change in air pressure affects the speed of sound.
2. Reason: The speed of sound in a gas is proportional to the square of the pressure

Mark the correct choice as

1. Assertion: Sound travels faster in solids than in gases.
2. Reason: Solid posses a greater density than that of gases.

What is a longitudinal wave?

What is the audible range of frequency?

What is the minimum distance needed for an echo?

What will be the frequency sound having 0.20 m as its wavelength, when it travels with a speed of 331 ms^–1?

Name three animals, which can hear ultrasonic vibrations.

Why does sound travel faster on a rainy day than on a dry day?

Why does an empty vessel produce more sound than a filled one?

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)

Explain why, the ceilings of concert halls are curved.

Mention two cases in which there is no Doppler effect in sound?

A sound wave has a frequency of 200 Hz and a speed of 400 ms^–1 in a medium. Find the wavelength of the sound wave.

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?

A person who is sitting at a distance of 400 m from a source of sound is listening to a sound of 600 Hz. Find the time period between successive compressions from the source?

An ultrasonic wave is sent from a ship towards the bottom of the sea. It is found that the time interval between the transmission and reception of the wave is 1.6 seconds. What is the depth of the sea, if the velocity of sound in the seawater is 1400 ms^–1?

A man is standing between two vertical walls 680 m apart. He claps his hands and hears two distinct echoes after 0.9 seconds and 1.1 seconds respectively. What is the speed of sound in the air?

Two observers are stationed in two boats 4.5 km apart. A sound signal sent by one, under water, reaches the other after 3 seconds. What is the speed of sound in the water?

A strong sound signal is sent from a ship towards the bottom of the sea. It is received back after 1s. What is the depth of sea given that the speed of sound in water 1450 ms^–1?

What are the factors that affect the speed of sound in gases?

What is mean by the reflection of sound?

Explain reflection at the boundary of a rarer medium.

Explain reflection at the boundary of a denser medium.

Explain Reflection at curved surfaces.

What do you understand by the term ‘ultrasonic vibration’?

State three uses of ultrasonic vibrations.

Name three animals which can hear ultrasonic vibrations.

What is an echo?

State two conditions necessary for hearing an echo.

What are the medical applications of echo?

How can you calculate the speed of sound using echo?

Suppose that a sound wave and a light wave have the same frequency, then which one has a longer wavelength?

When sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound remain the same. Do you hear an echo sound on a hotter day? Justify your answer.