Atomic Structure STBAtomic Structure MCQs (STB)#Atomic Structure#Bohr Model71Choose the best answerWhat is the potential energy of an electron at distance r from a nucleus of charge +Ze?A−Ze²/4πε₀rB−Ze²/8πε₀rCZe²/4πε₀r²Dmv²/r Like 0 Discuss 0Share
Atomic Structure STBAtomic Structure MCQs (STB)#Atomic Structure#Emission Spectrum72Choose the best answerWhich source produces an emission-line spectrum?ASunlight passing through a prismBExcited sodium vapour in a discharge lampCWhite light passing through a cold gasDAn incandescent solid Like 0 Discuss 0Share
Atomic Structure STBAtomic Structure MCQs (STB)#Atomic Structure#Neutron Number73Choose the best answerHow is the number of neutrons in an atom calculated?AMass number + atomic numberBMass number − atomic numberCAtomic number − mass numberDNumber of protons + number of electrons Like 0 Discuss 0Share
Atomic Structure STBAtomic Structure MCQs (STB)#Atomic Structure#Bohr Model74Choose the best answerWhat does the negative sign in the electron–nucleus potential-energy expression indicate?AThe nucleus and electron repel each otherBThe electron-nucleus system is bound by attractive forcesCThe electron possesses a positive chargeDPotential energy is independent of distance Like 0 Discuss 0Share
Atomic Structure STBAtomic Structure MCQs (STB)#Atomic Structure#Planck's Constant75Choose the best answerWhat is the accepted value of Planck’s constant?A6.626 × 10⁻³⁴ J sB8.854 × 10⁻¹² C² J⁻¹ m⁻¹C1.602 × 10⁻¹⁹ CD1.097 × 10⁷ m⁻¹ Like 0 Discuss 0Share