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The energy of a hydrogen atom in its ground state is –13.6 eV. The energy of the level corresponding to the quantum number n = 5 is :CorrectIncorrect
The energy of an electron in nth orbit of the hydrogen atom is given by,
E(n)= -13.6/n^2 ev
The energy required to raise an electron from the first orbit to the second orbit will be :CorrectIncorrect
The ionisation energy of Hydrogen atom is 13.6 eV. Following Bohr’s theory the energy corresponding to a transition between the 3rd and the 4th orbit is :CorrectIncorrect
Ionisation potential of Hydrogen atom is 13.6 eV. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. The spectral lines emitted by Hydrogen atoms according to Bohr’s theory will be :CorrectIncorrect
A radioactive substance has a half-life of 60 minutes. During 3 hours the fraction of atom that have decayed would be :CorrectIncorrect
At any instant the ratio of the amount of radioactive substance is 2 : 1. If their half lives be respectively 12 and 16 hours, then after two days, what will be the ratio of the substances ?CorrectIncorrect
Which of the following transitions in a hydrogen atom emits the photon of highest frequency ?CorrectIncorrect
The de-Broglie wavelength of a particle moving with a velocity 2.25 x 10^8 m/s is equal to the wavelength of a photon. The ratio of kinetic energy of the particle to the energy of the photon is :
[Velocity of light is 3 x 10^8 m/s]CorrectIncorrect
Electrons used in an electron microscope are accelerated by a voltage of 25 kV. If the voltage is increased to 100 kV then the de-Broglie wavelength associated with the electrons would :CorrectIncorrect
The half life of a radioactive isotope ‘X’ is 20 years. It decays to another element ‘Y’ which is stable. The two elements ‘X’ and ‘Y’ were found to be in the ratio 1 : 7 in a sample of a given rock. The age of the rock is estimated to be :CorrectIncorrect