The energy in monochromatic X-rays of wavelength 1 angstrom is roughly equal to

$2 \times 10^{- 15} J$

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$2 \times 10^{- 16} J$

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$2 \times 10^{- 17} J$

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$2 \times 10^{18} J$

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Solution

The correct option is A
$2 \times 10^{- 15} J$

Energy, $E = h ν = \frac{h c}{λ} = \frac{6.6 \times 10^{- 34} \times 3 \times 10^{8}}{10^{- 10}} = 1.98 \times 10^{- 15} J \approx 2 \times 10^{- 15} J$
Hence, the correct choice is (a).

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The energy in monochromatic X-rays of wavelength 1 angstrom is roughly equal to

The correct option is A 2×10−15 J Energy, E=hν=hcλ=6.6×10−34×3×10810−10=1.98×10−15 J≈2×10−15 J Hence, the correct choice is (a).

The correct option is A
$2 \times 10^{- 15} J$

Energy, $E = h ν = \frac{h c}{λ} = \frac{6.6 \times 10^{- 34} \times 3 \times 10^{8}}{10^{- 10}} = 1.98 \times 10^{- 15} J \approx 2 \times 10^{- 15} J$
Hence, the correct choice is (a).