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11th West Bengal Board
IMPORTANT
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Two identical flutes produce a fundamental frequency of 300Hz at 17°C. If the temperature of air in one flute be increased to 30°C, the number of beats heard per second will be

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Important Questions on Waves

EASY
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 22 - Waves>EXERCISE>Q 72
Which of the following expression is that of a simple harmonic progressive wave?
MEDIUM
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 22 - Waves>EXERCISE>Q 73
Equation of a stationary wave is ε=10sin(πx4)cos20πt Distance between two consecutive nodes is :
MEDIUM
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 22 - Waves>EXERCISE>Q 74
Three parts of a the length of a stretched wire have frequencies n1, n2, n3 .The frequency n of the whole wire is :
MEDIUM
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 22 - Waves>EXERCISE>Q 75
A mirror is a good reflector of light wave but a poor reflector of sound waves while a big tree is a good reflector of sound wave but a poor reflector of light waves. This happens because light waves and sound waves differ in their,
EASY
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 22 - Waves>EXERCISE>Q 76
Standing waves can be produced
MEDIUM
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 22 - Waves>EXERCISE>Q 77
A transverse sinusoidal wave of amplitude a, wavelength λ and frequency f is travelling on a stretched string. The maximum speed of any point on the string is V10, where V is the speed of propagation of the wave. If  a=10-3 m and V=10 m s-1 then λ and f are given by
MEDIUM
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 22 - Waves>EXERCISE>Q 78
A tuning fork of known frequency 256 Hz makes 5 beats per second with the vibrating string of a piano. The beat frequency decreases to 2 beats per second when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was
EASY
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 22 - Waves>EXERCISE>Q 79
On a sonometer,two wires of same material are stretched under equal tension.The ratio of their lengths and radii are 2:1 and 1:4 respectively.The ratio of their frequencies is :