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Q.

The following figure shows two air-filled bulbs connected by a U-tube partly filled with alcohol What happened to the levels of alcohol in the limbs X and Y when an electric bulb placed midway between the bulbs is lighted?

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a

The level of alcohol in limb X falls while that in limb Y rises

b

The level of alcohol in limb X rises while that in limb Y falls

c

The level of alcohol falls in both limbs

d

The level of alcohol rises in both limbs

answer is A.

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Detailed Solution

Black bulb will radiate more energy to the air column causing more expansion of air column in limb x. So alcohol level in limb x will fall.
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The following figure shows two air-filled bulbs connected by a U-tube partly filled with alcohol What happened to the levels of alcohol in the limbs X and Y when an electric bulb placed midway between the bulbs is lighted?