Question

Value of adiabatic bulk modulus of elasticity of helium at $NTP$ is

• A. $1.01\times 10^{5}Nm^{- 2}$
• B. $1.01\times 10^{- 5}Nm^{- 2}$
• C. $1.69\times 10^{5}Nm^{- 2}$
• D. $1.69\times 10^{- 5}Nm^{- 2}$

Answer 1

Answer: (C)

$B=\gamma P$
For $He$ , $\gamma =\frac{5}{3}$
And pressure at $NTP$ is $P=1.01\times 10^{5}Nm^{- 2}$
$\therefore $ $B=\frac{5}{3}\left(1.01 \times 1 0^{5}\right)$
$B=1.69\times 10^{5}Nm^{- 2}$