Ques. 1JEE Main 2025, 23 January (Evening Shift)
Given below are two statements about X-ray spectra of elements : In the light of the above statements, choose the correct answer from the options given below :
- Statement I is false but Statement II is true
- Both Statement I and Statement II are true
- Statement I is true but Statement II is false
- Both Statement I and Statement II are false
Answer
(4) Both Statement I and Statement II are false
Solution
Moseley's law: =a(Z-b) — linear in Z, not in atomic mass; vs Z is a parabola
[figure]
∴ both statements false
Answer: (4)