alleryThe rms speed of helium atom at 300 K is approximately (M_He = 4 g/mol):
A~ 137 m/s
B~ 1368 m/s
C~ 5000 m/s
D~ 14 m/s
Answer & Solution
Correct answer: B. ~ 1368 m/s
$v_{rms} = \sqrt{3RT/M_0} = \sqrt{3 \cdot 8.314 \cdot 300/0.004} = \sqrt{1.87 \times 10^6} \approx 1368$ m/s.
(Helium escapes Earth's atmosphere over time because rms speed exceeds escape velocity for many atoms at higher altitudes.)
Keep practising Kinetic Theory & Oscillations
Browse all Kinetic Theory & Oscillations questions for Karnataka PUC I, or explore more Physics topics.
Related questions
NEET · Physics · Oscillation Period — Gap FillNEET · Physics · Kinetic Theory — SortA diatomic ideal gas has $C_v = \tfrac{5}{2}R$. Its $C_p$ and ratio $\gamma$ are:If $x_1 = A in(\omega t)$ and $x_2 = A in(\omega t + \pi/3)$, the resultant amplitude of $Two springs of constants $k_1$ and $k_2$ connected in **series** have effective spring conA spring of force constant $k$ is cut into two equal halves. The force constant of each haThe phase difference between displacement $x$ and velocity $v$ in SHM is:A simple pendulum of period $T$ on Earth is taken to the Moon where $g_{moon} = g/6$. Its