An engine takes in 
moles of air at 
and 
, and compresses it adiabatically to 
of the original volume. Assuming air to be a diatomic ideal gas made up of rigid molecules, the change in its internal energy during this process comes out to be 
. The value of 
to the nearest integer is
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(46 JEE Main 2020)
For adiabatic process 
constant
Here 
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