The wavelength of the most energetic X- ray emitted when a metal target is bombarded by 100 keV electrons, is approximately

Question

The wavelength of the most energetic X- ray emitted when a metal target is bombarded by 100 keV electrons, is approximately (A) 12 mathringA (B) 4 mathringA (C) 0.31 mathringA (D) 0.124 mathringA

Tardigrade Admin · Accepted Answer

Wavelength λ =(12375/E) mathringA =(12375/100 × 103) mathringA =0.12375 mathringA =0.124 mathringA

Q. The wavelength of the most energetic $X -$ ray emitted when a metal target is bombarded by $100 k e V$ electrons, is approximately

$12 \overset{˚}{A}$

$4 \overset{˚}{A}$

$0.31 \overset{˚}{A}$

$0.124 \overset{˚}{A}$

Wavelength $λ = \frac{12375}{E} \overset{˚}{A}$
$= \frac{12375}{100 \times 1 0 ^{3}} \overset{˚}{A}$
$= 0.12375 \overset{˚}{A}$
$= 0.124 \overset{˚}{A}$

Q. The wavelength of the most energetic X− ray emitted when a metal target is bombarded by 100keV electrons, is approximately

12A˚

4A˚

0.31A˚

0.124A˚