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QNEET-2013-Ph-1491: NEET 2013 Physics - Class 12 NEET-2013-Ph-1491 Solution: A parallel beam of fast moving electrons is incident normally…
A parallel beam of fast moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased which of the following statements is correct? The angular width of the central maximum will decrease. The angular width of the central maximum will be unaffected. Diffraction pattern is not observed on the screen in the case of electrons. The angular width of the central maximum of the diffraction pattern will increase.
Multiple Choice Options
- A The angular width of the central maximum will decrease.
- B The angular wifth of the central maximum will be unaffected.
- C Diffraction pattern is not observed on the screen in the case of electrons.
- D The angular width of the central maximum of the diffraction pattern will increase.
Step-by-Step Verified Solution
As speed of an electron increases.
Its de-Broglie wavelength decreases
_ = h m v
and angular width for central maxima is _ = 2 _ d
_ _ _ _ 1 v