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UPSC NDA II 2018 General Ability Solved Paper

Question : 95 of 150

Marks: +1, -0

The wavelength of X-rays is of the order of

Solution:

Concept:

X-rays are electromagnetic waves with wavelengths in the range of about

1\ \text{Å}

(angstrom).

Explanation:

X-rays are a type of electromagnetic radiation.

Their wavelength is very short — typically of the order of

1\ \text{Å}

(

10^{-10}\ \text{m}

In contrast,

1\ \mu\text{m}

(micrometer) is

10^{-6}\ \text{m}

1\ \text{mm}

10^{-3}\ \text{m}

, and

1\ \text{cm}

10^{-2}\ \text{m}

Only

1\ \text{Å}

matches the known order of X-ray wavelengths.

Answer:

1\ \text{Å}

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