Question

The maximum frequency and minimum wavelength of X- rays produced by 30kV electrons respectively is :

• A. $7.24 \times 10^{18}Hz,0.041nm$
• B. $3.21 \times 10^{18}Hz,0.211nm$
• C. $5.32 \times 10^{18}Hz,0.001nm$
• D. $2.13 \times 10^{18}Hz,0.011nm$

Answer 1

Answer: (A)

$7.24 \times 10^{18}Hz,0.041nm$

Answer 2

: here, $V = 30kV,h = 6.63 \times 10^{- 34}js$

As $eV = h\upsilon_{\max}$

Or ${\upsilon\frac{eV}{h}\frac{1.6 \times 10^{- 19} \times 3 \times 10^{4}}{6.63 \times 10^{- 34}}}_{\max}$

$= 7.24 \times 10^{18}Hz$