MHT CET 2025 26th April Morning Shift | Dual Nature of Radiation Question 5 | Physics

Light of incident frequency 3 times the threshold frequency is incident on a photosensitive material. If the incident frequency is made $\left(\frac{1}{4}\right)^{\text {th }}$ and intensity is tripled then the photoelectric current will

increase.

decrease.

be $\left(\frac{1}{3}\right)^{\text {rd }}$

be zero.

MHT CET 2025 26th April Morning Shift

MCQ (Single Correct Answer)

-0

The wavelength ' $\lambda$ ' of a photon and the deBroglie wavelength of an electron have same value. the ratio of kinetic energy of the electron to the energy of a photon is

( $\mathrm{m}=$ mass of electron, $\mathrm{c}=$ velocity of light, $\mathrm{h}=$ Planck's constant)

$\frac{2 \lambda \mathrm{mc}}{\mathrm{h}}$

$\frac{\lambda \mathrm{mc}}{\mathrm{h}}$

$\frac{\mathrm{h}}{2 \lambda \mathrm{mc}}$

$\frac{\mathrm{h}}{\lambda \mathrm{mc}}$

MHT CET 2025 25th April Evening Shift

MCQ (Single Correct Answer)

-0

If the frequency of incident light in a photoelectric experiment is doubled, then stopping potential will

be doubled.

be halved.

become more than double.

become less than double.

MHT CET 2025 25th April Evening Shift

MCQ (Single Correct Answer)

-0

An electron of mass ' $m$ ' and charge ' $e$ ' initially at rest gets accelerated by a constant electric field ' E '. The rate of change of de-Broglie wavelength of the electron at time ' $t$ ' is

(Ignore relativistic effect)( $\mathrm{h}=$ Planck's constant)

$-\frac{\mathrm{h}}{\mathrm{eEt}^2}$

$-\frac{\mathrm{eEt}}{\mathrm{h}}$

$\frac{-\mathrm{mh}}{\mathrm{eEt}^2}$

$-\frac{\mathrm{h}}{\mathrm{eE}}$

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