Q 1) Explain the concept of end correction.
Q 2) Write a short note on coefficient of emission.
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Q 1) Explain the concept of end correction.
Ans 1) In acoustics, end correction is a short distance applied or added to the actual length of a resonance pipe, in order to calculate the precise resonant frequency of the pipe. The pitch of a real tube is lower than the pitch predicted by the simple theory.
Q 2) Write a short note on coefficient of emission.
Ans 2) Coefficient of emission of a body is the ratio of the emissive power of the body at agiven temperature to the emissive power of a perfectly black body at the same temperature.
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Explanation:
Emissive power of a body at a given temperature is the quantity of radiant energy emitted by the body per unit time per unit surface area of the body at that temperature.
If 'Q' is the amount of radiant energy emitted, 'A' is the surface area of the body and 't ' is the time for which body radiates energy, then the emissive power is
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