A 0.66 kg ball is moving with a speed of 100 m/s. The associated wavelength will be:

$(h=6.6\times {10}^{-34}$ $Js)$

1. $6.6\times {10}^{-34}m$

2. $1.0\times {10}^{-35}$ $m$

3. $1.0\times {10}^{-32}m$

4. $6.6\times {10}^{-32}$ $m$

According to the Bohr Theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?
1. n = 5 to n = 3
2. n = 6 to n = 1
3. n = 5 to n = 4
4. n = 6 to n = 5

The nuclei of which one of the following pairs are isotones:

If the energy value is E = 3.03 × 10^–19 Joules, (h = 6.6×10^–34 J x sec., C = 3×10⁸ m/sec), then the value of the corresponding wavelength is:

If the energy of the second Bohr orbit of the hydrogen atom is –328 kJ mol^–1, the energy of the fourth Bohr orbit would be:

Which of the following molecule is not paramagnetic:
1. $C{u}^{++}$

2. $F{e}^{2+}$

3. $C{l}^{-}$

4. None of the above 

The radius of a hydrogen shell is 0.53Å. In its first excited state, radius of the shell will be:
1. 2.12 Å
2. 1.06 Å
3. 8.5 Å
4. 4.24 Å

Uncertainty in position of a $e^{-}$ and He is similar. If uncertainty in momentum of $e^{-}$ is $32\times {10}^5$, then uncertainty in momentum of He will be:

Ionization energy of second orbit of $L{i}^{+2}$ will be:
1.  122.4 eV
2.  40.8 eV
3.  30.6 eV
4.  13.6 eV

The frequency of radiation emitted when the electron falls from n = 4 to n = 1 in a hydrogen atom will be:
(Given ionization energy of H = 2.18 × 10^–18 J atom ^–1 and h = 6.625 × 10^–34 Js):

1. 1.03 × 10¹⁵ s^–1

2. 3.08 × 10¹⁵ s^–1

3. 2.00 × 10¹⁵ s^–1

4. 1.54 × 10¹⁵ s^–1