1.

One kg of a diatomic gas is at pressure of `8xx10^4N//m^2`. The density of the gas is `4kg//m^3`. What is the energy of the gas due to its thermal motion?A. `3xx10^(4)J`B. `5xx10^(4)J`C. `6xx10^(4)J`D. `7xx10^(4)J`

Answer» Correct Answer - B
Thermal energy correspods to internal energy
Mass=1kg, Density
`=4kgm^(-3)`
`rArr" " "Volume"=("mass")/("density")=(1)/(4)m^(3)`
pressure=`8xx10^(4)Nm^(-2)`
`therefore` Internal energy `=(5)/(2)PxxV=(5)/(2)xx(8xx10^(4))/(4)=50+10^(4)"Joule"`


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