What will happen for potential energy if a body when the height is doubled keeping mass constant?

Argon is adiabatically compressed from an initial volume of 16 liters to a final volume of 2 liters. by what factor do the following quantities change? do they increase or decrease? (a) the rms speed (b) the thermal energy of the gas (c) the molar specific heat cv (d) the pressure

What is the role of lenses in microscopy?

What is the relationship between wavelength of light and the quantity of energy per photon?