What is a longitudinal wave Class 7?

Longitudinal waves are the waves where the displacement of the medium is in the same direction as the direction of the travel of the wave.

What is longitudinal wave answer?

Definition of longitudinal wave

: a wave (such as a sound wave) in which the particles of the medium vibrate in the direction of the line of advance of the wave.

What are longitudinal waves simple?

A longitudinal wave is a wave in which the particle movement is parallel to the direction of the wave propagation. This means that the particles move left and right which in turn makes the other particles start to oscillate.

Why are longitudinal waves called sound waves Class 7?

A sound wave is called a longitudinal wave because compressions and rarefactions in the air produce it. The air particles vibrate parallel to the direction of propagation.

What are longitudinal waves and examples?

In a longitudinal wave the particles are displaced parallel to the direction the wave travels. An example of longitudinal waves is compressions moving along a slinky. We can make a horizontal longitudinal wave by pushing and pulling the slinky horizontally.

What are the types of sound waves?

Sound waves fall into three categories: longitudinal waves, mechanical waves, and pressure waves.

How are sound waves produced?

When an object vibrates, it causes movement in surrounding air molecules. These molecules bump into the molecules close to them, causing them to vibrate as well. This makes them bump into more nearby air molecules. This “chain reaction” movement, called sound waves, keeps going until the molecules run out of energy.

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How do you calculate wave speed?

According to the formula for wave speed, wave speed = wavelength/time period . Since the S.I. unit of wavelength is meter (m) and that of time period is second (s).

How is ultrasound used for cleaning for class 9th?

Ultrasound is used to clean ‘hard to clean’ parts of objects such as spiral tubes, odd-shaped machines etc. The object to be cleaned is placed in a cleaning solution and ultrasound waves are passed into the solution. Due to their high frequency, the ultrasound waves stir up the cleaning solution.

How does STD 7 produce sound?

Sound is produced by vibration. When a body vibrates, it forces the neighbouring particles of the medium to vibrate. This creates a disturbance in the medium, which travels in the form of waves. This disturbance, when reaches the ear, produces sound.

What is Doppler Effect Class 11?

The Doppler effect is the apparent change in frequency of a wave when the observer and the source of the wave move relative to each other.

What is Transmission sound?

The passage of sound from one point to another, e.g., from one room in a building to another, or from the street into a room in the building.

Why does an echo form?

This phenomenon is called an echo, which has its origins in the Greek ekho, meaning “sound.” An echo happens when a sound wave reflects off a surface, such as the water at the bottom of a well, and the sound is repeated back to you.

How does a guitar string make sound?

Sound is produced by striking the strings and making them vibrate. The energy of the vibrating strings is transferred to the soundboard through the bridge. The guitar’s hollow body amplifies the sound of the vibrating strings.

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How many types of sound are there?

The three types of sound are: Infrasonic: It is a sound with a frequency of less than 20Hz. Elephants use Infrasonic sounds to interact with herds hundreds of km away. Sonic: It is a sound with the frequency between 20 to 20,000Hz.

What is a medium in waves?

In a similar manner, a wave medium is the substance that carries a wave (or disturbance) from one location to another. The wave medium is not the wave and it doesn’t make the wave; it merely carries or transports the wave from its source to other locations.

How long a wave is?

The wavelength of a wave describes how long the wave is. The distance from the “crest” (top) of one wave to the crest of the next wave is the wavelength. Alternately, we can measure from the “trough” (bottom) of one wave to the trough of the next wave and get the same value for the wavelength.

How is ultrasound done?

A trained technician (sonographer) presses a small, hand-held device (transducer) against the area being studied and moves it as needed to capture the images. The transducer sends sound waves into your body, collects the ones that bounce back and sends them to a computer, which creates the images.

How defects in a metal block can be detected using ultrasound?

Ultrasound is passed through one end of a metal block, and detectors are placed on the other end. The defective part of the metal block does not allow ultrasound to pass through it. As a result, it will not be detected by the detector. Hence, defects in metal blocks can be detected using ultrasound.

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What is frequency of sound Class 8?

Frequency: The number of vibrations made by the vibrating body in one second is known as its frequency. The SI unit of frequency is the hertz (Hz).

What is a magnetic field Class 7?

(c) Magnetic field is defined as the region around a magnet where the magnetic force can be experience by an object. Magnetic field lines are the geometrical representation of magnetic field.

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