MHT CET 2025 23rd April Evening Shift | Dual Nature of Radiation Question 7 | Physics

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

$4 \lambda$

$2 \lambda$

$\frac{\lambda}{2}$

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

MHT CET 2025 23rd April Morning Shift

MCQ (Single Correct Answer)

-0

For two different photosensitive materials having work function $\phi$ and $2 \phi$ respectively, are illuminated with light of sufficient energy to emit electrons. If the graph of stopping potential versus frequency is drawn, for these two different photosensitive materials, the ratio of slope of graph for these two materials is

$1: 1$

$1: 2$

$1: 4$

$4: 1$

MHT CET 2025 23rd April Morning Shift

MCQ (Single Correct Answer)

-0

The energy that should be added to an electron to reduce its de-Broglie wavelength from $\lambda$ to $\frac{\lambda}{2}$ is $n$ times the initial energy. The value of ' $n$ ' is

MHT CET 2025 22nd April Evening Shift

MCQ (Single Correct Answer)

-0

When the electron orbiting in hydrogen atom goes from one orbit to another orbit (principal quantum number $=n$ ), the de-Broglie wavelength ( $\lambda$ ) associated with it is related to $n$ as

$\lambda \propto \frac{1}{\mathrm{n}^2}$

$\lambda \propto n^2$

$\lambda \propto \frac{1}{n}$

$\lambda \propto \mathrm{n}$

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