Rankers Physics

Photoelectric Effects and deBroglie Equation: Practice Problem & Solution

The ratio of wavelength of deutron and proton accelerated through the same potential difference will be :
1/√2
\[\sqrt{\frac{2}{1}}\]
1/2
2/1

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1. The stopping potential in the photoelectric experiment is \( 1.6\text{ V} \). The maximum kinetic energy of photoelectrons emitted is
2. A photoelectric surface is illuminated successively by monochromatic light of wavelength $\lambda$ and $\lambda/2$. If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface of the material is: ($h$ = Plank's constant, $c$ = speed of light) (2015 Re)
3. Assertion (A): In photoelectric effect, the number of photoelectrons emitted is always equal to number of photons incident. Reason (R): All the photons falling on the surface will eject photoelectrons.  
4. When the energy of the incident radiation is increased by 20%, the kinetic energy of the photoelectrons emitted from a metal surface increased from 0.5eV to 0.8eV. The work function of the metal is :
5. Assertion (A): On increasing the frequency of incident light, the photoelectric current increases. Reason (R): Photoelectric current depends upon the wavelength of incident light.