CBSE 2023 · Region 3 · Set 3 · Q30 · 3 marks
(a)The figure shows de Broglie wavelength ( $\displaystyle \lambda$ ) for two particles A and B having same charges but different masses as a function of $\displaystyle \frac{1}{\sqrt{\mathrm{~V}}}$, where V is the potential through which the particles are accelerated.
(i)Which of them is heavier and why?(ii)What does the slope of the line represent?(b)Calculate the momentum of an electron having de Broglie wavelength of $\displaystyle 3 \cdot 0 \AA$.
(a)
The figure shows de Broglie wavelength ( $\displaystyle \lambda$ ) for two particles A and B having same charges but different masses as a function of $\displaystyle \frac{1}{\sqrt{\mathrm{~V}}}$, where V is the potential through which the particles are accelerated.
(i)
Which of them is heavier and why?
(ii)
What does the slope of the line represent?
(b)
Calculate the momentum of an electron having de Broglie wavelength of $\displaystyle 3 \cdot 0 \AA$.
Marking-scheme solution
(a) (i) B is heavier than A Reason- Slope \(\displaystyle \alpha \frac{1}{\sqrt{m}}\)
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CBSE Class 12 Physics past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.