1
MHT CET 2024 10th May Evening Shift
MCQ (Single Correct Answer)
+1
-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$)$

A
$\frac{2 \mathrm{hc}}{\lambda}$
B
$\frac{\mathrm{hc}}{\lambda}$
C
$\frac{2 h \mathrm{c}}{3 \lambda}$
D
$\frac{\mathrm{hc}}{3 \lambda}$
2
MHT CET 2024 10th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

When a photosensitive surface is irradiated by lights of wavelengths ' $\lambda_1$ ' and ' $\lambda_2$ ', kinetic energies of the emitted photoelectrons is ' $E_1$ ' and ' $E_2$ ' respectively. The work function of the photosensitive surface is

A
$\frac{\left(E_2 \lambda_2-E_1 \lambda_1\right)}{\left(\lambda_2-\lambda_1\right)}$
B
$\frac{\left(E_1 \lambda_1+E_2 \lambda_2\right)}{\left(\lambda_2-\lambda_1\right)}$
C
$\frac{\left(E_1 \lambda_1-E_2 \lambda_2\right)}{\left(\lambda_2-\lambda_1\right)}$
D
$\frac{\left(E_2 \lambda_2+E_1 \lambda_1\right)}{\left(\lambda_1-\lambda_2\right)}$
3
MHT CET 2024 10th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

In photoelectric effect, the photocurrent

A
decreases with increase in frequency of incident photon.
B
increases with increase in frequency of incident photon.
C
does not depend on the frequency of photon but depends only on the intensity of incident light.
D
depends both on intensity and frequency of incident radiation.
4
MHT CET 2024 10th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

If the potential difference used to accelerate electrons is increased four times, by what factor does the de-Broglie wavelength associated with the electrons change?

A
Wavelength increased two times
B
Wavelength decreased to half
C
Wavelength increased four times
D
Wavelength remains the same
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