1)witch one is Balmer series ?
A.$1/\lambda=R(1/1^{2}-1/2^{2})$
B.$1/\lambda=R(1/2^{2}-1/2^{2})$
C.$1/\lambda=R(1/3^{2}-1/2^{2})$
D.$1/\lambda=R(1/4^{2}-1/2^{2})$
2)we have one wave with wavelength $\lambda= 6000 A$ ,find the frequency of this wave?
A.$10^{13}$
B.$5.10^{14}$
C.$5.10^{15}$
D.$6.10^{15}$
3) what is the value of energy for free particule?
A. E<-10 e.v
B . E=-10 e.v
C. E=-13.6 e.v
D. E>= 0 e.v
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