The surface temperature of a hot body is `1227^@C`. Find the wave length at which it radiates maximum energy. Given wien's constant=0.2898cmk

If temperature of a black body increases then what does happen to the wavelength with which maximum energy is associated ?

The specific rate constant for a reaction increases by a factor if the temperature is changed from 27^(@) C to 47^(@) C. Find the activation energy for the reaction. (R = 198 cal )

Calculate the temperature at which RMS velocity of a gas is half its value at 0^@c , pressure remaining constant.

The photoelectric threshold wavelength of certain material is 6000 overset(@) (A) . Find the maximum kinetic energy of the ejected photelectros in electron-volts if the wavelength of the incident radiation is 4000 overset(@)(A) . (Given h = 6.62 xx 10^- 34 Js and c = 3 xx 108 m//s)

Photoelectrons of maximum kinetic energy of 2.3 eV and 0.06eV are emitted respectively from a metal surface by radiations of wavelength 200 nm and 313 nm. Calculate the value of Planck's constant from this data.