Let $F_{1}$ be the set of all parallelograms, $F_{2}$ the set of all reactangles, $F_{3}$ the set of all rhombuses, $F_{4}$ the set of all sqauares and $F_{5}$ the set of trapeziums in a plane. Then $F_{1}$ may be equal to

v_{1}

is the frequency of the series limit of Lyman series,

v_{2}

is the frequency of the first line of Lyman series and

v_{3}

is the frequency of the series limit of the Balmer series. Then

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If f1 is the frequency of the series limit of Lyman series, f2 is the frequency of first line of Lyman series and f3 is the frequency of the series limit of the Balmer series then:

The correct option is A f1−f2=f3 Frequency f0=Rc(1n21−1n22) f1=Rc(1−1∞),f2=Rc(1−14)=34Rcf3=Rc(14−1∞)=Rc4f1−f2=f3

If $f_{1}$ is the frequency of the series limit of Lyman series, $f_{2}$ is the frequency of first line of Lyman series and $f_{3}$ is the frequency of the series limit of the Balmer series then:

The correct option is A $f_{1} - f_{2} = f_{3}$

Frequency $f_{0} = R c (\frac{1}{n_{1}^{2}} - \frac{1}{n_{2}^{2}})$
$f_{1} = R c (1 - \frac{1}{\infty}), f_{2} = R c (1 - \frac{1}{4}) = \frac{3}{4} R c f_{3} = R c (\frac{1}{4} - \frac{1}{\infty}) = \frac{R c}{4} f_{1} - f_{2} = f_{3}$