time interval between the transmission and reception of the wave is . seconds. What is the depth of the sea, if the velocity of sound in the seawater is ms – ? .
A man is standing between two vertical walls m apart. He claps his hands and hears two distinct echoes after . seconds and . second respectively.
What is the speed of sound in the air? . Two observers are stationed in two boats . km apart.
A sound signal sent by one, under water, reaches the other after seconds. What is the speed of sound in the water? . A strong sound signal is sent from a ship towards the bottom of the sea.
It is received back after 1s.What is the depth of sea given that the speed of sound in water ms – ? IX. Answer in Detail . What are the factors that affect the speed of sound in gases?
. What is mean by reflection of sound? Explain: a) reflection at the boundary of a rarer medium b) reflection at the boundary of a denser medium c) Reflection at curved surfaces . a) What do you understand by the term ‘ultrasonic vibration’?
b) State three uses of ultrasonic vibrations. c) Name three animals which can hear ultrasonic vibrations. . What is an echo?
a) State two conditions necessary for hearing an echo. b) What are the medical applications of echo? c) How can you calculate the speed of sound using echo? X.
HOT Questions . Suppose that a sound wave and a light wave have the same frequency, then which one has a longer wavelength? a) Sound b) Light c) both a and b d) data not sufficient . When sound is reflected from a distant object, an echo is produced.
Let the distance between the reflecting surface and the source of sound remain the same. Do you hear an echo sound on a hotter day? Justify your answer. REFERENCE BOOKS .
Fundamental Physics by K.L. Gomber and K.L. Gogia . Fundamentals of