Dual Nature of ...

 When light of wave length 300 nm falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, however, light of 600nm wavelength is sufficient for creating photoemission. What is the ratio of the work functions of the two emitters?

 The work function of aluminum is 4.2 eV. If two photons each of energy 3.5 eV strike an electron of aluminum, then emission of electron will be

An electron accelerated by a potential difference of V volt posses a de Broglie wave length . If the accelerating potential is increased by a factor of 4, the de-Broglie wavelength of the electron will be 

 Monochromatic light of wave length 667 nm is produced by a helium neon laser. The power emitted is 9mW. The number of photons arriving per second on the average at a target irradiated by this beam is

 According to Einstein's interpretation of the photoelectric effect, the maximum K.E. of photoelectrons depends on ( h -W) where is the frequency of incident radiation and W is the work function. For three different metals graph plotted between maximum K/E. and the frequency of incident radiations. The three graphs obtained: 

According to Einstein's photoelectric equation, the graph of K.E. of the photoelectron emitted from the metal versus the frequency of the incident radiation gives a straight line graph, whose slope 

If the kinetic energy of the moving particle is $$E$$, then the de Broglie wavelength is

The threshold frequency for a photo-sensitine metal is $$3.3\times { 10 }^{ 14 }Hz$$. If light of frequency $$8.2\times { 10 }^{ 14 }Hz$$ is incident on this metal, the cut-off voltage for the photo-electric emission is nearly

The kinetic energy of an electron get tripled then the de-Broglie wavelength associated with electron changes by a factor of

Photons of energy $$7 e V$$ are incident on two metals A and B with work functions $$6 eV$$ and $$3 eV$$ respectively. The minimum de Broglie wavelengths of the emitted photoelectrons with maximum energies are $$\lambda_A$$ and $$\lambda_B$$ , respectively where $$\lambda_A / \lambda_B $$ is nearly :