Dual Nature of ...

If the de-Broglie wavelength of a particle of mass $$m$$ is $$100$$ times its velocity then its value in terms of its mass $$(m)$$ and Planck's constant $$(h)$$ is:

Work function of a metal is $$5.2\times 10^{-18}\ J$$, then its threshold wavelength will be 

Photoelectrons are liberated by ultraviolet light of wavelength $$3000\mathring{A}$$ from a metallic surface for which the photoelectric threshold is $$4000\mathring{A}$$. The de-Broglie wavelength of electrons emitted with maximum kinetic energy is:

The work function of metals is in the range of $$2$$ eV to $$5$$ eV. Find which of the following wavelength of light cannot be used for photoelectric effect. (Consider, Planck constant  $$=4\times10^{-15}$$eVs, velocity of light $$= 3\times 10^8m/s$$).

 The work function of a metallic substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from the substance is approximately..

A ruby laser produces radiations of wavelengths, 662.6 nm in pulse duration are 10$$^{-6}$$s. If the laser produces 0.39 J of energy per pulse, how many photons are produced in each pulse?

The stopping potential as function of frequency of incident radiation is plotted for two different photoelectric surfaces A and B. The graphs show that the work function of A is

A particle of mass 1kg is moving with a velocity of 1m/s. The de-broglie wavelength associated with it will be 

The de-Broglie wavelength of a proton and alpha particle is same, the ratio of their velocities is :

Electrons used in an electron microscope are accelerated by a voltage of $$25\ kV$$. If the voltage is increased by $$100\ kV$$ then the de-Broglie wavelength associated with electrons would