Last seen: Jan 25, 2021
Use of ultrasound: 1. Ultrasound is used to detect cracks and flaws in metal blocks. 2. It is used in ‘echo-cardiography’, the ultrasonic waves ar...
Frequency = = 10 Hz Time period = ? Frequency = ∴ T = = = 0.1 s
Amplitude: The magnitude of the maximum disturbance in the medium on either side of the mean value is called amplitude of the wave. Its unit is meter....
(i) Ships use reflection of sound technique “SONAR” which helps in locating the depth, distance, direction and speed of underwater objects. (ii) Cei...
(a) low pitched sound and (b) a high pitched sound. 2s.png
Velocity of sound is the speed of sound in a given medium at a given temperature. As the temperature increases the speed of sound also increases, henc...
The distinct sound heard after reflection of sound from the source is called echo. For echo, the distance of reflecting surface from the source should...
When a wave is propagated as represented below. A peak is called the crest and a valley is called the trough of a wave. 2s.png
Longitudinal wave 1. It needs medium for propagation. 2. Particles of the medium move in a direction parallel to the direction of propagation of t...
Longitudinal waves need medium for propagation. The sound energy travel in the same line as the particles oscillate. Sound energy Particles oscil...
Sound is a form of energy. As it moves away from the source its amplitude as well as its loudness decreases. The energy also get transformed in vibrat...
When an object just attains a supersonic speed, it causes shock waves in air. As a result there is large change in air pressure. This results in sonic...
A wave is a disturbance that moves through a medium when the particles of the medium set neighbouring particles into motion. The particles of the medi...
The matter or substance through which sound is transmitted is called a medium. It can be solid, liquid or gas. Example, air, water, metals.
To hear a distinct sound the time interval between the originated sound and the reflected sound must be at least 0.1 second.
Sound waves with frequencies below the audible range (less than 20 Hz) are termed as “infrasonic” and those sound waves with frequencies above the aud...
SONAR is Sound Navigation and Ranging. It is a device that uses ultrasonic waves to measure the distance, direction and speed of underwater objects by...
The repeated reflection that results in the persistence of sound is called reverberation.
The minimum distance of the obstacle from the source of sound should be 17.2 m.
The time taken by two consecutive compressions or rarefactions to cross a fixed points is called the time period of the wave.