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. $6.6\times {10}^{-32}$ $m$

The orbital angular momentum of a p-electron is given as:

1.  $\sqrt{3}$ $\frac{h}{2\pi }$

2.  $$ $\sqrt{\frac{3}{2}}\frac{h}{\pi }$

3. $\sqrt{6}$ $\sqrt{\frac{h}{2\pi }}$

4.  $\frac{h}{\sqrt{2}\pi }$

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 maximum wavelength in the Lyman series of He⁺ ion is -

1. 3R

2.$\frac{1}{3R}$

3.  $\frac{1}{R}$

4. 2R

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:

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 $\mathrm{32 }\times {10}^5$, then uncertainty in momentum of He will be:

In the Hydrogen atom, the energy of the first excited state is – 3.4 eV. Then find out K.E(kinetic energy) of the same orbit of the Hydrogen atom:

1. + 3.4 eV

2. + 6.8 eV

3. – 13.6 eV

4. + 13.6 eV

The value of Planck's constant is 6.63 × 10^–34 J s. The velocity of light is 3.0 × 10⁸ m s^–1. The closest value to the wavelength in nanometers of a quantum of light with a frequency of $8\times {10}^{15}$ ${\mathrm{s}}^{-1}$ is:

1. $2\times {10}^{-25}$

2. $5\times {10}^{-18}$

3. $4\times {10}^1$

4. $3\times {10}^7$