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Avijeet Rathsharma Grade: 12
        

Q No.-1> atoms may be regarded as comprising of p's,n's and e's.if the mass attributed by electrons was doubled and that by neutrons was halved d at mass of C-12 'll b?


a)approx. the same


b)doubled


c)reduced aprrox. 25%


d)approx. halved


Q No 2> the wave no. fo 1st line of Balmer series of H z 15200cm^-1.the wave no of the first balmer line of Li2+ ion z?


a)15200


b)60800


c)76000


d)136800

7 years ago

Answers : (2)

Ramesh V
70 Points
										

(1)


C-reduced approx. by 25 %


(2)


For atoms ions ,


                           R*(1/n2)*Z2


For Lithium , its    = 15000*32


                         = 136800


--


regards


Ramesh

7 years ago
deeksha sharma
40 Points
										

1) c reduced by 25%.


reason --- electrons do not constitute the mass. so their doubling would bring negligible effect. halving of neutrons. will let them 3


thus the mass is p+n   6+3=9 i.e. reducedby 25%


2) FOR H like atoms, it is n2*wave no for H


=15200*3=136800

6 years ago
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