Define frequency and wave length with reference to sound. Explain what to echo. Write full form of SONAR. Give anyone application of ultrasound.
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number of vibrations or oscillations per second is called the frequency of a sound a wavelength is the distance between two continuous rarefractions or two continuous compressions in a sound wave the reason created after the original sound is produced due to reflection of sound is called an echo full form of s o n a r sound navigation and ranging ultrasonic sounds are used in ultrasonography and echocardiography
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