Advertisements
Advertisements
Question
What is the condition necessary for an echo to be heard distinctly?
Advertisements
Solution
Echo is a reflected sound heard after the original sound strikes a rigid obstacle...
The conditions are-
1- The reflecting surface should have a larger reflecting surface than the wavelength of the sound
2- The minimum distance to hear the echo should be 17m in the air or as described by the formula `(Vt)/2`...
RELATED QUESTIONS
How is the frequency of a stretched string related it’s tension?
Displacement distance graph of two sound waves A and B, travelling in a medium, are as shown in the diagram below.
Study the two sound waves and compare their:
1) Amplitudes
2) Wavelengths
Define amplitude term in relation to a wave.
Name the waves which are used in sonar to find the depth of a sea. Give one reason for their use.
What is a stethoscope ? Name the principle on which a stethoscope works.
Draw a labelled diagram to show the multiple reflections of sound in a part of the stethoscope tube.
Point out the waves from the given list, i.e., light, sound, radio waves, ultrasonic waves, and thermal radiation, the energy is propagated by mechanical waves.
Draw a diagram representing a wave of amplitude 4 cm and wavelength 2 m. If the frequency of the wave is 150 Hz, calculate its velocity.
A sound wave whose frequency is 5000 Hz travels in air and then hits the water surface. The ratio of its wavelengths in water and air is ______.
