MHT CET 2025 25th April Morning Shift | Dual Nature of Radiation Question 10 | Physics

When a metal surface is illuminated by light of wavelength $\lambda_1$ and $\lambda_2$, the maximum velocities of photoelectrons ejected are V and 2 V respectively. The work function of the metal is ( $\mathrm{h}=$ Planck's constant, $\mathrm{c}=$ velocity of light, $\lambda_1>\lambda_2$ )

$\frac{\mathrm{hc}}{2 \lambda_1 \lambda_2}\left(\lambda_1-\lambda_2\right)$

$\frac{\mathrm{hc}}{\lambda_1 \lambda_2}\left(\lambda_1-\lambda_2\right)$

$\frac{\mathrm{hc}}{\lambda_1 \lambda_2}\left(\lambda_1+\lambda_2\right)$

$\frac{\mathrm{hc}}{3 \lambda_1 \lambda_2}\left(4 \lambda_2-\lambda_1\right)$

MHT CET 2025 25th April Morning Shift

MCQ (Single Correct Answer)

-0

Sodium and copper have work functions 2.3 eV and 4.5 eV respectively. The ratio of threshold wavelength of sodium to that of copper is nearest to

$1: 4$

$4: 1$

$1: 2$

$2: 1$

MHT CET 2025 23rd April Evening Shift

MCQ (Single Correct Answer)

-0

Graph shows variation of stopping potential with frequency of incident radiation on a metal plate. The value of Planck's constant is [ $\mathrm{e}=$ charge on photoelectron]

MHT CET 2025 23rd April Evening Shift Physics - Dual Nature of Radiation Question 9 English

$\frac{e\left(V_2-V_1\right)}{v_1 v_2}$

$\frac{e V_1 V_2}{\left(v_2-v_1\right)}$

$\frac{e\left(V_2-V_1\right)}{\left(v_2-v_1\right)}$

$\frac{e\left(V_1 V_2\right)}{v_1 v_2}$

MHT CET 2025 23rd April Evening Shift

MCQ (Single Correct Answer)

-0

Electron beam when accelerated by a voltage of 10 kV , has a de-Broglie wavelength ' $\lambda$ '. If the voltage is increased to 20 kV then the deBroglie wavelength associated with the electron beam would be

$4 \lambda$

$2 \lambda$

$\frac{\lambda}{2}$

$\frac{\lambda}{\sqrt{2}}$

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