MEDIUM
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In a grease spot photometer, light from a lamp with dirty chimney is exactly balanced by a point source distance 10 cm from the grease spot. On clearing the dirty chimney, the point source is moved 2 cm to obtain a balance again. Then the percentage of light absorbed by the dirty chimney is nearly
(a)64%
(b)36%
(c)44%
(d)56%

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Important Questions on Wave Motion on a String
EASY
A uniform string of length is suspended from a rigid support. A short wave pulse is introduced at its lowest end. It starts moving up the string. The time taken to reach the support is
(Take, )

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EASY

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HARD

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The amplitude and time period of the motion are:

EASY

EASY

EASY

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EASY

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A transverse wave propagating on a stretched string of linear density is represented by the equation
where, in metres and is in seconds. The tension in the string (in Newton) is

HARD

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HARD

