MHT CET 2024 11th May Evening Shift | Dual Nature of Radiation Question 36 | Physics

A photoelectric surface is illuminated successively by monochromatic light of Wavelength $\lambda$ and $(\lambda / 3)$. If the maximum kinetic energy of the emitted photoelectrons in the second case is 4 times that in the first case, the work function of the surface of the material is $(\mathrm{h}=$ Planck's constant, $\mathrm{c}=$ speed of light $)$

$\frac{\mathrm{hc}}{\lambda}$

$\frac{\mathrm{hc}}{2 \lambda}$

$\frac{\mathrm{hc}}{3 \lambda}$

$\frac{3 \mathrm{hc}}{\lambda}$

MHT CET 2024 11th May Morning Shift

MCQ (Single Correct Answer)

-0

If the frequency of incident radiation $(\nu)$ is increased, keeping other factors constant, the stopping potential ( $\nu>\nu_0$, threshold frequency)

increases

decreases

remains constant

suddenly becomes zero

MHT CET 2024 11th May Morning Shift

MCQ (Single Correct Answer)

-0

If the potential difference used to accelerate electrons is doubled. By what factor does the deBroglie wavelength $(\lambda)$ associated with the electrons change?

$\lambda$ is increased to $\sqrt{2}$ times.

$\lambda$ is increased to $\frac{1}{\sqrt{2}}$ times.

$\lambda$ is decreased to $\frac{1}{\sqrt{2}}$ times.

$\lambda$ is decreased to $\sqrt{2}$ times.

MHT CET 2024 10th May Evening Shift

MCQ (Single Correct Answer)

-0

A photoelectric surface is illuminated successively by monochromatic light of wavelength ' $\lambda$ ' and $\left(\frac{\lambda}{2}\right)$. If the maximum kinetic energy of the emitted photoelectrons in the first case is one-fourth that in the second case, the work function of the surface of the material is ( $\mathrm{c}=$ speed of light, $\mathrm{h}=$ Planck's constant$)$

$\frac{2 \mathrm{hc}}{\lambda}$

$\frac{\mathrm{hc}}{\lambda}$

$\frac{2 h \mathrm{c}}{3 \lambda}$

$\frac{\mathrm{hc}}{3 \lambda}$

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