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 ${}^{\prime }{A}^{\prime }$ mechanical energy in moving car is converted to kinetic energy and in ${}^{\prime }{B}^{\prime }$ potential energy is converted to chemical energy.
• B. In ${}^{\prime }{A}^{\prime }$ potential energy in moving car is converted to kinetic energy and in ${}^{\prime }{B}^{\prime }$ chemical energy is converted to light energy.
• C. In ${}^{\prime }{A}^{\prime }$ kinetic energy in moving car is converted to potential energy and in ${}^{\prime }{B}^{\prime }$ potential energy is converted to light energy.
• D. In ${}^{\prime }{A}^{\prime }$ kinetic energy in moving car is converted to potential energy and in ${}^{\prime }{B}^{\prime }$ light energy is converted to chemical energy.

Answer 1

The correct option is D In ${}^{\prime }{A}^{\prime }$ kinetic energy in moving car is converted to potential energy and in ${}^{\prime }{B}^{\prime }$ 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 $\left(h\right)$.
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.