Question

Q. Consider the following statements with respect to X-rays:

Which of the statements given above is/are correct?

• A.
  1 only
• B.
  2 and 3 only
• C.
  1, 2 and 3
• D.
  1 and 2 only

Answer 1

The correct option is A

1 only

Explanation:

Statement 1 is correct: X-rays are roughly classified into two types: soft X-rays and hard X-rays.

Statement 2 is incorrect: Soft X-rays comprise the range of the EM spectrum between UV and gamma rays. Soft X-rays have frequencies of about 3 × 10¹⁶ to about 10¹⁸ Hz and wavelengths of about 10 nm to about 100 picometers (pm).

Statement 3 is incorrect: Hard X-rays occupy the same region of the EM spectrum as gamma rays. The only difference between them is their source: X-rays are produced by accelerating electrons, while gamma rays are produced by atomic nuclei.