Answer:

Explanation:
As we know that rms speed of ideal gas is given by the formula

here we know that

molecular mass of gas is given as

now from above formula we have

now we have

A type of material that tries to prevent the flow of thermal energy is called an insulator.
Answer:
The distance is 
Explanation:
From the question we are told that
The wavelength of the light source is 
The distance from a pin hole is 
The diameter of the pin hole is 
Generally the distance which the light source need to be in order for their diffraction patterns to be resolved by Rayleigh's criterion is
mathematically represented as

substituting values

