Dual Nature of ...

Calculate the wavelength of photon having energy 5 e.v.

An electron from various excited states of hydrogen atom emit radiation to come to the ground state.. $$  \lambda_n, \lambda_n, \lambda_g $$ be the de Broglie wavelength of the electron in the $$ n^{th} $$ state and the ground state respectively. Let $$ \Lambda_n $$ be the wavelength of the emmited photon in the transition from the $$ n^{th} $$ state to the ground state.For large n, (A,B are constants)

If the wavelength of an electromagnetic radiation is 2000$$\overset {o}A$$
 A. What is the energy in ergs?

Calculate energy of one mole of photons of radiation whose frequency is $$5\times 10^{14}Hz$$.

A certain metal when irradiated by light ($$(v=3.2 \times 10^{16}HZ)$$ emits photoelectrons with twice K. E. as did photoelectrons when the same metal is irradiated by light $$(v=2 \times 10^{16}HZ)$$. The $$V_{0}$$ of the neutral is 

What is the ratio of the De-Broglie wave lengths for electrons accelerated through 200 volts and 50 volts _____.

Assertion : The de Broglie wavelength of electron increases as the accelerating potential difference decreases.
Reason: The magnitude of charge on electron decreases with decreasing accelerating potential difference.

The frequency and wavelength of radiation which has energy of 5 eV is  

If change in energy:- $$\Delta E=3 \times { 10 }^{ -8 }J, \quad h=6.64 \times { 10 }^{ -64 } J-s\: and\: c=3\times{ 10 }^{ 8 }m/s$$ then wavelength of the light in $$mtrs$$ is:

If the radius of 1st bohr's orbit x then the de broglie's wavelength of $${ e }^{ \circleddash  }$$ in 3rd orbit is nearly equal to