• 072920 77839
  • info@smartachievers.in
Menu
Back
  • JEE ADVANCE
  • JEE MAIN
  • NEET
  • BITSAT
  • CBSE BOARD
  • UP BOARD
  • CUET
JEE ADVANCE
  • CLASS XI - XII
  • CRASH COURSE
CRASH COURSE
JEE MAIN
  • CLASS XI - XII
  • CRASH COURSE
CRASH COURSE
NEET
  • CLASS XI - XII
  • CRASH COURSE
BITSAT
  • CLASS XI - XII
CBSE BOARD
  • CLASS IX
  • CLASS X
  • CLASS XI
  • CLASS XII
  • CLASS VI
  • CLASS VII
  • CLASS VIII
UP BOARD
  • CLASS IX
  • CLASS X
  • CLASS XI
  • CLASS XII
CUET
  • CRASH COURSE
Courses


Solution


Q.

Given below are two statements about X-ray spectra of elements :                                 [2025]

Statement I: A plot of v (ν = frequency of X-rays emitted) vs atomic mass is a straight line.

Statement II: A plot of ν (ν = frequency of X-rays emitted) vs atomic number is a straight line.

In the light of the above statements, choose the correct answer from the options given below :
1 Statement I is true but Statement II is false  
2 Both Statement I and Statement II are false  
3 Both Statement I and Statement II are true  
4 Statement I is false but Statement II is true  

Ans.

(4)

Henry Moseley observed regularities in the characteristic X-ray spectra of the elements. A plot of v (where ν is frequency of X-rays emitted) against atomic number (Z) gave a straight line and not the plot of v vs atomic mass. He thereby showed that the atomic number is a more fundamental property of an element than its atomic mass.