Graph of specific heat at constant volume for a monoatomic gas is
A
B
C
D
Easy
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C
c $C_v$ constant for an atomic gas is $(32R)$. It does not change with temperature.
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An object is placed in a medium of refractive index $3$. An electromagnetic wave of intensity $6 \times 10^8 \mathrm{~W} / \mathrm{m}^2$ falls normally on the object and it is absorbed completely. The radiation pressure on the object would be (speed of light in free space $=3 \times 10^8 \mathrm{~m} / \mathrm{s}$ ):
A balloon contains $500\,{m^3}$ of helium at $27°C$ and $1$ atmosphere pressure. The volume of the helium at $-3°C$ temperature and $0.5$ atmosphere pressure will be ..... $m^3$
Air is pumped into an automobile tube upto a pressure of $200\, kPa$ in the morning when the air temperature is $22°C.$ During the day, temperature rises to $42°C$ and the tube expands by $2\%.$ The pressure of the air in the tube at this temperature, will be approximately ...... $kPa$
The root mean square speed of molecules of nitrogen gas at $27^{\circ} C$ is approximately$.......m/s$(Given mass of a nitrogen molecule $=4.6 \times 10^{-26}\,kg$ and take Boltzmann constant $k _{ B }=1.4 \times 10^{-23}\,JK ^{-1}$ )
An ideal gas initially at pressure $1$ bar is being compressed from $30 \,m ^{3}$ to $10\, m ^{3}$ volume and its temperature decreases from $320\, K$ to $280\, K$. then find final pressure of gas (in bar)
The value closest to the thermal velocity of a Helium atom at room temperature $(300\,K)$in $ms^{-1}$ is $[k_B\, = 1 .4\times10^{-23}\,J/K;\, m_{He}\, = 7\times10^{-27}\,kg]$