Test Preparation on Atomic Structure-III-Chemistry Test Series For NEET-2020

The wavelength of the radiation emitted, when in a hydrogen
atom electron falls from infinity to stationary state 1, would be
(Rydberg constant =1.097×10⁷m^-1 )

(a) 406 nm     (b) 192 nm
(c) 91 nm       (d) 9.1×10^-8 nm

The ionization enthalpy of hydrogen atom is
1.312×10⁶ J mol ^-1 . The energy required to excite the electron
in the atom from n = 1 to n = 2 is

(a) 6.56×10⁵ J mol ^-1
(b) 7.56×10⁵ J mol ^-1
(c) 9.84×10⁵ J mol ^-1
(d) 8.51×10⁵ J mol ^-1

The position of both an electron and a helium atom is known
within 1.0nm and the momentum of the electron is known
within 50×10^-26 kg ms^-1 . The minimum uncertainty in the
measurement of the momentum of the helium atom is

(a) 50kg ms^-1              (b) 60 kg ms^-1
(c) 80×10^-26 kg ms^-1  (d) 50×10-26 kg ms^-1