Atomic Structure | Physics JEE previous year questions with Solutions

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Topic Question Set

Q 1 :

The waves emitted when a metal target is bombarded with high energy electrons are [2023]

Radio Waves
Microwaves
X-rays
Infrared rays

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(3)

X rays are emitted when target metal is bombarded with high energy electron.

Q 2 :

Electrons with de-Broglie wavelength $λ$ fall on the target in an X-ray tube. The cut-off wavelength of the emitted X-rays is

$λ_{0} = \frac{2 m c λ^{2}}{h}$
$λ_{0} = \frac{2 h}{m c}$
$λ_{0} = \frac{2 m^{2} c^{2} λ^{3}}{h^{2}}$
$λ_{0} = λ$

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(1)

$p = \frac{h}{λ}$

$K.E. = \frac{p^{2}}{2 m} = \frac{h^{2}}{2 m λ^{2}}$

$\frac{h^{2}}{2 m λ^{2}} = \frac{h c}{λ_{0}}$

$λ_{0} = \frac{2 m c λ^{2}}{h}$

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