Structure of At...

The first use of quantum theory to explain the structure of atom was made by :

The wavelength associated with a golf ball weighing 200g and moving at a speed of 5m/h is of the order:

The longest wavelength of He⁺ in Paschen series is "m", then shortest wavelength of Be³⁺ in Paschen series is (in terms of m) :

What is uncertainity in location of a photon of wavelength 5000 Å if wavelength is known to an accuracy of 1 pm?

Consider the following nuclear reactions involving X & Y.

If both neutrons as well as protons in both the sides are conserved in nuclear reaction then moles of neutrons in 4.6 gm of X :

Electromagnetic radiations having λ = 310 Å are subjected to a metal sheet having work function = 12.8 eV. What will be the velocity of photoelectrons with maximum Kinetic energy.

Assuming Heisenberg Uncertainity Principle to be true what could be the miniumum uncertainity in de–Broglie wavelength of a moving electron accelerated by Potential Difference of 6V whose uncertainity in position is 7/22 n.m.

A 1-kW radio transmitter operates at a frequency of 880 Hz. How many photons per second does it emit -

The value of Bohr radius of hydrogen atom is -

On the basis of Bohr's model, the radius of the 3rd orbit is -