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प्रश्न
Give two practical applications of reflection of sound waves.
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उत्तर
- Megaphones or loudhailers, horns: Musical instruments such as trumpets and shehnai are all designed to send sound in a particular direction without spreading it in all directions.
- Stethoscope: A stethoscope is a medical instrument for listening to sounds produced within the body, mainly in the heart or lungs. In stethoscopes, the sound of the patient’s heartbeat reaches the doctor’s ears through multiple reflections of sound.
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संबंधित प्रश्न
Explain the working and application of a sonar.
Name the characteristic of sound which can distinguish between the 'notes' (musical sounds) played on a flute and a sitar (both the notes having the same pitch and loudness).
What happens to the pitch of a sound if its frequency increases ?
What name is given to sound waves of frequencies higher than 20 kHz ?
Fill in the blank with suitable word :
Loudness of sound depends on .....................
Draw labelled diagrams to represent sound of (a) low pitch, and (b) high pitch, of the same loudness.
How is it that bats are able to fly at night without colliding with other objects ?
What is the range of frequencies associated with (a) infrasound (b) audible sound, and (c) ultrasound ?
Write any three applications (or uses) of ultrasound.
In SONAR we use:
