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Waves MCQ 3

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Questions and Answers

In the Doppler effect formula, what does 'u' represent?

Relative speed between source and observer (correct)

Actual frequency

Apparent frequency

Velocity of the wave

What is the formula for the fundamental frequency of a stretched string?

f = 2l √(T/μ)

f = 1/√(2lT/μ)

f = 1/2l √(T/μ) (correct)

f = 1/l √(T/μ)

Which formula is used to calculate sound intensity in terms of power and area?

I=P/(4πr^2 )

I∝r^2

I=P/A (correct)

I∝1/r^2

What is the relationship between sound intensity and distance from the source?

Sound intensity is inversely proportional to distance squared Signup and view all the answers

What is the formula for calculating the apparent frequency in the Doppler effect?

f' = fc/(c+u) Signup and view all the answers

In the relationship between stationary and travelling waves, what is the internodal distance for a travelling wave?

0.5λ Signup and view all the answers

What does the symbol 'T' represent in the fundamental frequency formula of a stretched string?

Tension Signup and view all the answers

What is the relationship between sound intensity and the distance from the source?

I∝1/r^2 Signup and view all the answers

Which parameter does 'A' represent in the equation for sound intensity in terms of power and area?

Area Signup and view all the answers

In the Doppler effect, what happens to the apparent frequency (f') when the relative speed (u) between the source and the observer is moving towards each other increases?

It increases Signup and view all the answers

How does the sound intensity (I) vary with the distance (r) from a point source of sound in free space?

I is inversely proportional to the square of r Signup and view all the answers