Dual Nature of ...

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Which of the following particles - neutron, proton,electron and deuteron has the lowest energy if all have the same de Broglie wavelength:

In photo-electric effect, when photons of energy $$'hv\ '$$ are incident on a metal surface, electrons are emitted with some kinetic energy. It is possible to say that

An electron of charge 'e' and mass 'm' is accelerated from rest by a potential difference 'V'. The de Broglie wavelength is

Two photons, each of energy 2.5 eV are simultaneously incident on the metal surface. If the work function of the metal is 4.5 eV, then from the surface of the metal

The graph between the de Broglie wavelength and the momentum of a photon is a 

A cathode ray particle is accelerated from rest through a potential difference of 'V' volt. Speed of the particle is

The ratio of the wavelengths of a photon and that of an electron of same energy $$E$$ will be [$$m$$ is mass of electron]:

The wavelengths of a proton and a photon are same. Then :

An electron and a proton possess the same amount of Kinetic energy. Then the relation between the wavelength of electron$$(\lambda _{e})$$ and the wavelength of proton$$(\lambda _{p})$$ is