Dual Nature of Matter and Radiation MCQs for NEET — Physics Questions with Answers

The wave length corressponding to photon is $ 0.016 A ^\circ $ . Its K.E ………….J . $ ( h = 6.66 \times 10^{-34} SI , c = 3.0 \times 10^8 ms ^ {-1} ) $

In electron microscope electron behave like ...............

Photo electric effect is maximum in ...

Which experimental observation correctly account for the phenomenon?

The maximum kinetic energy of photoelectron emitted from the surface of work function f due to incidence of light of frequency n is E. If the frequency of incident light is doubled, then maximum kinetic of emitted photon will be

The de-Broglie associated with an electron accelerated through a voltage of 900 V is:

$$\begin{gathered} \mathrm{A} 200\mathrm{W} \mathrm{sodium} \mathrm{street} \mathrm{lamp} \mathrm{emits} \mathrm{yellow} \mathrm{light} \mathrm{of} \mathrm{wavelength} 0.60\mathrm{\mu m}. \mathrm{Assuming} \mathrm{it} \mathrm{to} \mathrm{be} \\ 50\% \mathrm{efficient}, \mathrm{in} \mathrm{converting} \mathrm{electrical} \mathrm{energy} \mathrm{into} \mathrm{light}, \mathrm{the} \mathrm{number} \mathrm{of} \mathrm{photons} \mathrm{of} \mathrm{yellow} \\ \mathrm{light} \mathrm{emitted} \mathrm{per} \mathrm{second} \mathrm{is} \mathrm{nearly} \mathrm{equal} \mathrm{to}- \end{gathered}$$

In a photoelectric experiment using a metal of work function 1.8 eV, if the maximum kinetic energy of emitted electrons is 1.5eV, then the corresponding value to stopping potential is:

Electrons used in an electron microscope are accelerated by a voltage of 25 kV. If the accelerating voltage is reduced to 6.25 kV, the resolving power of the microscope would:

When the light of wavelength $\mathrm{\lambda }$ is used in a photoelectric experiment, the maximum kinetic energy of emitted electrons is found to be K. What will the maximum kinetic energy of the photoelectrons when the light of wavelength $\frac{\mathrm{\lambda }}{2}$ is used instead of $\mathrm{\lambda }$: