NEET Physics Dual Nature of Matter and Radiation MCQs

An electron of mass m and a photon have same energy E. the ratio of de-Brogile wavelengths associated with them is:

SS

(c being velocity of light)

When a metallic surface is illuminated with radiation of wavelength $\lambda$, the stopping potential is V. If the same surface is illuminated with radiation of wavelength $2\lambda$, the stopping potential is $\frac{{\rm{v}}}{4}$. The threshold wavelength for the metallic surface is:

Electrons of mass m with de-Broglie wavelength $\lambda$ fall on the target in an X-ray tube. The cutoff wavelength $({\lambda _0})$ of the emitted X-ray is:

Photons with energy $5{\mkern 1mu} {\mkern 1mu} \,eV$ incident on a cathode C in a photoelectric cell. The maximum energy of emitted photoelectrons is $2\,e{\mkern 1mu} V$. When photons of energy $6\,eV$ are incident on C, no photoelectrons will reach the anode A, if the stopping potential of A relative to C is:

An electron of mass m and a photon have same energy E. the ratio of de-Brogile wavelengths associated with them is:

SS

(c being velocity of light)

When a metallic surface is illuminated with radiation of wavelength $\lambda$, the stopping potential is V. If the same surface is illuminated with radiation of wavelength $2\lambda$, the stopping potential is $\frac{{\rm{v}}}{4}$. The threshold wavelength for the metallic surface is:

The photoelectric threshold wavelength of silver is $3250 imes {10^{ - 10}}{\rm{ m}}{\rm{.}}$The velocity of the electron ejected from a silver surface by ultraviolet light of wavelength $2536 imes {10^{ - 10}}{\rm{ms}}$(Given $h = 4.14 imes {10^{ - 15}}{\rm{ eVs \;and \;}}c = 3 imes {10^8}{\rm{ m}}{{\rm{s}}^{ - 1}}$)