The Li²⁺ ion is a hydrogen like ion that can be described by the Bohr model. Calculate the Bohr radius of the third orbit and calculate the energy of an electron in 4^th orbit.

Protons can be accelerated in particle accelerators. Calculate the wavelength (in Å) of such accelerated proton moving at 2.85 x 10⁸ ms^-1 (the mass of proton is 1.673 x 10^-27 Kg).

What is the de Broglie wavelength (in cm) of a 160 g cricket ball travelling at 140 Km hr ^-1.

Show that if the measurement of the uncertainty in the location of the particle is equal to its de Broglie wavelength, the minimum uncertainty in its velocity is equal to its velocity 1/4\(\pi\) of its velocity (V).

Identify the missing quantum numbers and the sub energy level

n	1	m	Sub energy level
?	?	0	4d
3	1	0	?
?	?	?	5p
?	?	-2	3d