Last seen: Jan 25, 2021
Take an electric bell and an air tight glass bell jar. The electric bell is suspended inside an air tight glass jar which is connected to a vacuum pum...
(i) When a vibrating object moves forward, it pushes the air in front of it and compresses the air creating a region of high pressure called compressi...
Sound is a form of energy and it is produced due to vibrations of different types of object, e.g., a vibrating tuning fork, a bell, wires in a sitar a...
Speed of sound in salt water = 1531 m s-1 Time taken by sonar pulse to return = 1.02 sec Distance travelled 2 × d = speed × time 2 x d = 1531 x 1.02...
(i) Frequencies associated with infra sound : < 20 Hz. (ii) Frequencies associated with ultrasound : > 2 × 104 Hz.
20 Hz to 20,000 Hz.
The ceilings of the concert halls are curved to ensure that after reflection from the ceilings, sound reaches all corners of the hall.
Given, speed of sound in air = 342 m s-1. Time taken by echo to return, t = 3 s If d is the distance between the source and the reflecting surface, di...
The speed of sound in air = 346 m s-1. The speed of sound in water = 1531 m s-1. The speed of sound in iron = 5950 m s-1. .’. The speed of soun...
Loudness (i) It is not an entirely physical quantity. (ii) It depends upon (a) sensitivity of the ear and (b) intensity of sound. (iii) It h...
Here, frequency of the source, u = 500 Hz Time period of the tone, T = = The time period between successive compressions from the source is equa...
Here, frequency of the sound wave, v = 220 Hz Speed of the sound wave, v = 440 ms-1 As v = vλ, λ = = = 2 m
The speed is defined as the distance travelled by a wave per unit time. Speed = = λ is the wavelength, T is time period. v = uλ ∴ v = 1/T ∴ ...
(i) Wavelength : The distance between two consecutive compressions (C) or two consecutive rarefactions (R) is called the wavelength, unit-metre. (ii...
A guitar has a higher pitch than a car horn, provided the guitar is properly tuned.
(i) Loudness is determined by the amplitude of the sound wave which in turn depends on the force with which the object is made to vibrate. (ii) Pitc...
No, we will not be able to hear the sound because sound requires a medium for its propagation. On the moon there is no atmosphere, i.e., there is vacu...
Waves which need a material medium for propagation are called mechanical waves. Since sound waves also need a material medium for propagation, these w...
When the school bell is struck with a hammer, it starts vibrating and as a result of these vibrations, sound waves are produced.
When a disturbance is created on an object, it starts vibrating and sets the particles of the medium to vibrate. The particle of the medium is displac...