What will be the angle between the hour and minute hands at 3 : 20 ?

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#Question id: 19972

#XL - P Chemistry

The momentum of a photon of frequency 50 × 10¹⁷S^–1 is nearly

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#Question id: 19973

#XL - P Chemistry

A near U.V. photon of 300 nm is absorbed by a gas and then remitted as two photons. One photon is red with wavelength760 nm. Hence wavelength of the second photon is

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#Question id: 19974

#XL - P Chemistry

The transition in He⁺ ion that would have the same wave number as the first Lyman line in hydrogen spectrum is

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#Question id: 19975

#XL - P Chemistry

The work function of a metal is 4.2 eV. If radiations of 2000 A⁰ fall on the metal then the kinetic energy of the fastest photo electron is

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#Question id: 19976

#XL - P Chemistry

A certain metal when irradiated to light ( = 3.2 × 1016 Hz) emits photoelectrons with twice kinetic energy as did photo electrons when the same metal is irradiated by light ( = 2.0 × 10¹⁶Hz). The of metal

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#Question id: 19977

#XL - P Chemistry

The ratio of the radial of the first three Bohr orbit in H atom is