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UPSC NDA II 2015 General Ability Paper

Question : 110 of 150

Marks: +1, -0

The wavelength of X-rays is of the order of

Solution:

Concept:

X-rays are electromagnetic waves with very short wavelengths, typically on the order of

1 \, \text{Å}

(angstrom).

Explanation:

The wavelength range of X-rays is roughly

0.01 \, \text{Å}

100 \, \text{Å}

, but the typical order is around

1 \, \text{Å}

1 \, \text{Å} = 10^{-10} \, \text{m}

Comparing with the other options:

1 \, \mu\text{m} = 10^{-6} \, \text{m}

1 \, \text{mm} = 10^{-3} \, \text{m}

1 \, \text{cm} = 10^{-2} \, \text{m}

Only

1 \, \text{Å}

falls in the X-ray wavelength range.

Answer:

Option A:

1 \, \text{Å}

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