Dual Nature of ...

The energy associated with a radiation having wavelength 300 nm is nearly [h= $$6.626\times 10^{-34}Js]$$:

Given diagram indicates the energy levels of certain atoms. When the system moves from $$2\,E$$ level to $$E$$, a photon of wavelength $$\lambda$$ is emitted. The wavelength of photon produced during its transition from $$\dfrac{4E}{3}$$ level to $$E$$ is-

A particle 'A' of mass 'm' and charge 'q' is accelerated by a potential difference of 50 V. Another particle B of mass '4m' and charges 'q' is accelerated by a potential difference of 2500 V. The ratio of de-Broglie 
wavelengths $$\dfrac { \lambda _{ A } }{ \lambda _{ B } } $$ is close to :

The frequency of light emitted for the transition $$n = 4$$ to $$n = 2$$ of He is equal to the transition atom corresponding to which of the following in Hydrogen atom?

The electronic transition from $$n=2$$ to $$n=1$$ will produce shortest wavelength in

The increase in the energy of an electron for changing its de-Broglie wavelength from $$1$$ $$\overset { \circ  }{ A } $$ to $$0.5$$ $$\overset { \circ  }{ A } $$ will be -

 $$E_1$$, $$E_2$$ and $$E_3$$ are the KE of an electron. $$\alpha$$ -particle and a proton $$(H^+)$$. The de wavelength of all the particles is equal, then 

An electron is confined to tube of length L, the electron's potential energy in one half of the tube is zero, while the potential energy in the other half is 10eV. if the electrons has a total energy E= 15 eV, then the ratio of the de brogile wavelength of the electron in the 10 eV region of the tube to that inthe other half is :-

At $${ 200 }^{ \circ  }C$$ hydrogen molecules have velocity $$2.4\times cm\quad { s }^{ -1 }$$. The Imbroglio wavelength in this case is approximately. 

If the velocity of hydrogen molecular is $$5\times { 10 }^{ 4 }cm /sec$$ then its de-Broglie wavelength is