What is ultrasonics? The study and application of mechanical vibrations with frequencies beyond the limits of hearing of the human ear i.e ,with frequencies about 20 kHz and upwards.There is no theoretical upper limit to the ultrasonic frequency ,although ultrasonic applications are usually restricted to about 20 MHz.Ultrasonic waves have the same basic properties as sound waves,both being examples of ...

What is simple harmonic motion? Simple harmonic motion is defined as:”When the net force is directly proportional to the displacement from the mean position and is always directed towards mean position.” A body is said to be vibrating if it moves back and forth or to and fro about a point.Another term for vibration is oscillation.A special kind of vibratory ...

What is intensity of sound? “Sound energy passing per second through a unit area held perpendicular to the direction of propagation of sound waves is called intensity of sound.”The sound waves transfer energy from the sounding body to the listener.The intensity of sound depends on the amplitude of sound waves.Intensity is a physical quantity and can be measured accurately.The unit ...

What is the meaning of Resonance? Resonance occurs when the frequency of the applied force is equal to one of the natural frequencies of vibration of the forced or driven harmonic oscillator. Associated with the motion of a driven harmonic oscillator, there is a very striking phenomenon, known as resonance. It rises if the external driving force is periodic with ...

What is speed of sound? Sound waves can be transmitted by any medium containing particles that can vibrate.They cannot pass through vacuum.However,the nature of the medium will affect the speed of the sound waves.In general,the speed of sound in a liquid is five times that in gases;the speed of sound in solid is about fifteen times that in gases.The speed ...

What is sound? “Sound is a form of energy that is passed from one point to another as a wave.”Sound is an example of a longitudinal wave.One major reason for learning about sound is that we experience it every moment of our lives in the form of music,noise and communication.From the large vocabulary we have of sounds (e.g clank,ping,bang,pop,hiss) and ...

What is wave? Waves transport energy without transporting matter. The energy transportation is carried by a disturbance,which spreads out from a source. We are well familiar with different types of waves such as water waves in the ocean, or gently formed ripples on a still pond due to rain drop. When a musician plucks a guitar-string, sound waves are generated ...

What is Doppler effect? “The apparent change in the frequency due to relative motion between source and observer is known as Doppler effect.” When a listener is in motion toward a stationary source of sound ,the pitch (frequency) of the sound heard is higher than when the listener is at rest.If the listener is in motion away from the stationary ...