Hydrogen Spectra

Q.

The kinetic energy of an electron with de-Broglie wavelength of 0.3 nanometer is

1. 0.168 eV

2. 1.68 eV

3. 16.8 eV

4. 2.5 eV

Q. The Lyman series of hydrogen spectrum lies in the region

1. Infrared
2. Visible
3. Ultraviolet
4. Of X - rays

Q. In the spectrum of hydrogen atom, ratio of the longest wavelength in Lyman series to the longest wavelength in Balmer series is:

1. $\frac{5}{27}$
2. $\frac{1}{93}$
3. $\frac{4}{9}$
4. $\frac{3}{2}$

Q.

The Lyman series of hydrogen spectrum lies in the region of

1. Infrared

2. Visible

3. Ultraviolet

4. x-rays

Q.

The ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series in the spectrum of hydrogen is _______.

Q. In the spectrum of hydrogen, the ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series is

1. $\frac{5}{27}$
2. $\frac{4}{9}$
3. $\frac{9}{4}$
4. $\frac{27}{5}$

Q. In the spectrum of hydrogen atom, ratio of the longest wavelength in Lyman series to the longest wavelength in Balmer series is:

1. $\frac{5}{27}$
2. $\frac{1}{93}$
3. $\frac{4}{9}$
4. $\frac{3}{2}$

Q.

Match the series with its corresponding $n_1$ value in the Rydberg's Formula

$\begin{array}{cc}A.Paschen& i)2\\ B.Lyman& ii)1\\ C.Balmer& iii)3\\ D.Pfund& iv)5\\ E.Brackett& v)4\end{array}$

1. a-iii ; b - ii; c - i ; d- iv; e - v

2. a-v ; b - i; c - iv ; d- ii; e - iii

3. a-iv ; b - iii; c - v ; d- i; e - ii

4. a-i ; b - v; c - ii ; d- iii; e - v

Q. The ratio of wave length of first line of Lyman series to the first line of Balmer series is

1. 1 : 4
2. 5 : 27
3. 27 : 20
4. 20 : 27