Electromagnetic radiation of wavelength 242 nm is just sufficient to ionise sodium atom. Calculate the ionisation energy of sodium in kJ `mol^-1`.

Nitrogen laser produces a radiation at a wavelength of 337.1 nm. If the number of photons emitted is 5.6 xx 10^24 , Calculate the power of this laser.

The rate constant for the first order reaction is given by log_(10) k = 14.34-1.25xx10^4 T . Calculate activation energy of the reaction (239.3 kJ//mol)

The vertical angle subtended by two points on a glass block at the objective of a microscope is 20^@ .Calculate the minimum distance between the points if they are just resolved when illuminated by light of wavelength 600 nm. What is the increase in resolving power of the instrument if the objective is immersed in oil of refractive index 1.5?

If the photon of the wavelength 150 pm strikes an atom and one of its inner bound electrons is ejected out with a velocity of 1.5 xx 10^7 ms^-1 , calculate the energy with which it is bound to the nucleus.

A 100 W sodium lamp radiates energy uniformly in all directions. The lamp is located at the centre of a large sphere that absorbs all the sodium light which is incident on it. The wavelength of the sodium light is 589 nm What is the energy per photon associated with the sodium light ?

How much energy is required to ionise a H atom if the electron occupied n = 5 orbit? Compare your answer with the ionization enthalpy of H atom (energy required to remove the electron from n = 1 orbit)

The wavelength of light from the spectral , emission line of sodium is 589 nm. Find the kinetic energy at which, a neutron would have the same de Broglie wavelength .

The wavelength of light from the spectral , emission line of sodium is 589 nm. Find the kinetic energy at which, an electron would have the same de Broglie wavelength .

A 100 W sodium lamp radiates energy uniformly in all directions. The lamp is located at the centre of a large sphere that absorbs all the sodium light which is incident on it. The wavelength of the sodium light is 589 nm At what rate are the photons delivered to the sphere ?

Yellow light emitted from a sodium lamp has a wavelength (lambda) of 580 nm. Calculate the frequency (v) and wave number (barv) of the yellow light.