Identify the energy changes in the following two 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 potential 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 is 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 is 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 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. ∴ Light energy gets converted to chemical energy.