Note :

If your answer  is options 1,3,4 then you have to fill the Answer as ‘134’ 

If your answer is options 2, 4 then you have to fill the answer as '24'

The correct statements among the following

1) EM waves having wave length 700nm to 1mm relates to magnetron valve    
2) EM waves having wave length 1nm to 400nm relates to inner shell electrons in atoms moving one energy to lower energy
3) EM waves having wave length  $<{10}^{-3}nm$ relates to radio active decay
4) EM waves having wave length  $1mm$ to  $0.1m$ relates to magnetron valve