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Question

Identify the energy changes in the following cases
A: A car moving up a hill.
B: Photographic film is exposed to sun-light.

A
In A mechanical energy in moving car is converted to kinetic energy and in B potential energy is converted to chemical energy.
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B
In A potential energy in moving car is converted to kinetic energy and in B chemical energy is converted to light energy.
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C
In A kinetic energy in moving car is converted to potential energy and in B potential energy is converted to light energy.
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D
In A kinetic energy in moving car is converted to potential energy and in B light energy is converted to chemical energy.
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Solution

The correct option is D In A kinetic energy in moving car is converted to potential energy and in B light energy is converted to chemical energy.
A: A car moving up a hill.
Moving car has kinetic energy, kinetic energy gets converted to potential energy as it gains height (h).
And potential energy =mgh
B: Photographic film is exposed to sun -light.
When photographic film is exposed to Sun the silver bromide present in it decomposes, such that the film cannot be developed, here the light energy changes to chemical energy.

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