Rydberg formula: compare the wavelengths or energies of two spectral lines (H or He+)

1. A.
   $\frac{36\lambda}{5}$
2. B.
   $\frac{9\lambda}{5}$
3. C.
   $\frac{5}{9\lambda}$
4. D.
   $\frac{5\lambda}{9}$

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1. A.
   $n = 2$ to $n = 1$
2. B.
   $n = 1$ to $n = 2$
3. C.
   $n = 3$ to $n = 4$
4. D.
   $n = 1$ to $n = 3$

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1. A.
   D $<$ C $<$ A $<$ B
2. B.
   A $<$ B $<$ C $<$ D
3. C.
   C $<$ D $<$ B $<$ A
4. D.
   D $<$ A $<$ C $<$ B

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1. A.
   $x^{2}$
2. B.
   $\frac{X}{1.35}$
3. C.
   $2x$
4. D.
   1.35 x

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1. A.
   $5:1$
2. B.
   5:0.81
3. C.
   $5:1.75$
4. D.
   5:27

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1. A.
   $\frac{9x}{5}$
2. B.
   $\frac{36x}{5}$
3. C.
   $\frac{x}{4}$
4. D.
   $\frac{5x}{9}$

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