Question

Given below are two statements about X-ray spectra of elements:
Statement (I):A plot of \(\sqrt {v}\) (v=frequency of X-rays emitted) vs atomic mass is a straight line.
Statement (II): A plot of v (v=frequency of X-rays emitted)} vs atomic number is a straight line.

• A. Statement I is true but Statement II is false
• B. Both Statement I and Statement II are true
• C. Both Statement I and Statement II are false
• D. Statement I is false but Statement II is true

Hint:

X-ray emission frequency typically follows Moseley's law, which indicates a square root dependence on the atomic number.

Answer 1

The Correct Option is C

Statement (I): A plot of frequency \( \nu \) vs atomic mass is not a straight line. The relationship between atomic mass and X-ray emission frequency is not linear. This statement is false. - Statement (II): A plot of frequency \( \nu \) vs atomic number is also not a straight line. The frequency of X-rays emitted generally follows Moseley's law, which is a square root function of the atomic number, not a linear function. This statement is false. Thus, both statements are false.