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An electron of mass me is moving in nth  orbit of hydrogen atom. Magnetic field at centre due to motion of electron, is(r0= Bohr radius)

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Important Questions on Atoms

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JEE Main/Advance
IMPORTANT
Electrons of mass m with de-Broglie wavelength λ fall on the target in an X-ray tube. The cut-off wavelength of the emitted X-rays is:
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JEE Main/Advance
IMPORTANT
Which one of the following statements is wrong in the context of X-rays generated from a X-ray tube?
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JEE Main/Advance
IMPORTANT
The first excitation potential (in eV) for H-atom is
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JEE Main/Advance
IMPORTANT
A proton moving with a speed u directly towards an α-particle (He nucleus) which, when the two particles were very far apart from one another, was initially at rest. The separation of the particles at their point of closest approach, is 5e2nπε0mpu2. Value of n, is (Assume mα=4mp).
MEDIUM
JEE Main/Advance
IMPORTANT
A hydrogen atom, initially at rest, emits a photon of energy E. The atom (mass M ) recoils with a speed of 2EnMc. Value of n, is
MEDIUM
JEE Main/Advance
IMPORTANT
Shortest wavelength of Bracket series of hydrogen like atom (atomic number =Z) and shortest wavelength of Balmer series of hydrogen atom are same. Then the value of Z is equal to
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JEE Main/Advance
IMPORTANT
Consider a hypothetical system in which a particle of mass m, charge (-2q) is moving around a massive and stationary particle of charge q, in a circular orbit. Assume Bohr's model to be valid for the system. The orbital speed in closed orbit has largest value equal to q2nε0h. Value of n, is
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JEE Main/Advance
IMPORTANT
de Broglie wavelength of an electron revolving in second orbit of hydrogen atom is nπa0. Value of n, is (a0 is Bohr radius)