$n_{1}$ and $n_{2}$ moles of two ideal gases (mol. wt. $M_{1}$ and $M_{2}$ ) respectively at temperature $T_{1}$ K and $T_{2}$ K are mixed. Assuming that no loss of energy, the temperature of mixture becomes

Q. A block body radiates heat at temperatures

T_{1}

and

T_{2} (T_{2} > T_{1})

. The frequency corresponding to maximum energy is

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The amount of heat energy required to raise the temperature of 1 g of Helium at NTP, from T1K to T2K is

The correct option is A 38NakB(T2−T1)Q=f2nRΔT32×14×kBNaΔT=38NakB(T2−T1)=38NakB(T2−T1)

The amount of heat energy required to raise the temperature of 1 g of Helium at NTP, from $T_{1} K$ to $T_{2} K$ is

The correct option is A $\frac{3}{8} N_{a} k_{B} (T_{2} - T_{1})$
$Q = \frac{f}{2} n R Δ T$
$\frac{3}{2} \times \frac{1}{4} \times k_{B} N_{a} Δ T$
$= \frac{3}{8} N_{a} k_{B} (T_{2} - T_{1}) = \frac{3}{8} N_{a} k_{B} (T_{2} - T_{1})$