A sample of an ideal gas is in a tank of constant volume. The sample absorbs heat energy so that its temperature changes from 335 K to 1340 K. If v1 is the average speed of the gas molecules before the absorption of heat and v2 their average speed after the absorption of heat, what is the ratio v2

The ratio of v₂/v₁ is 2

Explanation:

Here we have Charles law which can be presented as

P₁/T₁ = P₂/T₂

Therefore,

P₂ = T₂ × P₁/T₁

Also from the kinetic theory of gases we have;

Where:

= Rms speed

R = Universal gas constant

T = Temperature in Kelvin

MW = Molecular weight

We therefore have for the before and after speeds as

and

Therefore,  

∴ v₂/v₁ = 2.

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this