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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
(1)
C-reduced approx. by 25 %
(2)
For atoms ions ,
R*(1/n2)*Z2
For Lithium , its = 15000*32
= 136800
--
regards
Ramesh
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
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