Question

Define frequency and wavelength with reference to sound. Explain what is echo. Write full form of SONAR. Give anyone application of ultrasound application.

Answer 1

Hint
Frequency and wavelength both are in the form of waves, both are the function of the light sound waves and other waveforms. If there is a wave in the atmosphere, definitely that wave has some frequency and the wavelength. Even the light is also having the wavelength. The sound waves also have some wavelength.

Complete step by step answer
Frequency:
Frequency is the number of vibrations or the number of occurrences of a repeating event per unit time. The frequency is measured in terms of Hertz. In sound, the frequency is in the form of waves, so here frequency is defined as the number of waves that pass a fixed point in a given amount of time. For example, the frequency is one Hertz, that means one wave passes the fixed point in one second.
Wave length:
The wave length is the maximum distance between the two-consecutive crest. The wavelength is usually measured in terms of nanometers. The wavelength depends on the medium that a wave travels through. For example, the sound wave is travelling in the air having some wave length, but the same sound waves travel in the other medium which have different wavelengths.
Echo:
In audio signals and the sound waves, the echo will occur. Usually, echo is the reflection of the sound. The reflected sound will reach the listener after the original sound, it will be heard repeatedly so it is termed as echo. The delay of the echo is directly proportional to the distance of the reflecting surface from the source and the listener.
SONAR:
The full form of the SONAR is Sound Navigation and Ranging. SONAR is a technique used to navigate or communicate with objects under the water.
Application of ultrasonic waves:
1. In communication systems, the ultrasonic waves are used to pass the signal and, in some applications, the ultrasonic is used to determine the distance of the object under the water.
2. The ultrasonic waves are used in the mechanical industry to join or weld the two materials and also used in the electronic industry for soldering.

Note
Frequency is the number of vibrations through at point in a fixed time. Wavelength is the distance between two consecutive crests or troughs. Echo is the reflection of a sound after striking a surface. It can only be heard after a few seconds. Sonar - Sound Navigation and Ranging. Ultrasound is used to detect defects in metal structures.