the r.m.s. velocity of the molecules of a certain diatomic gas is found to be 1.6 Km/sec. the gas is

Options

A. H²
B. F²
C. O²
D. Cl²

Answer

a

Explanation

Rajesh experienced this pull, because of Bernoulli's theorem. As we know, pressure is inversely proportional to velocity, i.e. as velocity of air increases, the pressure of it decreases and vice versa. The region (air space) between Rajesh and the speeding train has air which is of greater velocity. So here in this region the pressure is less. But the region behind Rajesh has more pressure. i.e., velocity of air is less. Due to this reason, the pressure behind him, pushes him forward towards the train, so if is safer to keep distance from any moving objects like buses, lorries etc.
Equation of continuity :
For an imcompressible fluid the mass is conserved i.e `m_(1) = m_(2)`
`a_(1)v_(1) Delta t.rho = a_(1)v_(2)Delta t. rho`
`a_(1)v_(1) = a_(2)v_(2) rArr av` = constant
i.e. `a prop (1)/(v)`
a = cross - sectional area of the pipe
v = velocity of the fluid.