Physics Past Questions and Answers

In which of the following transitions is the largest quantum of energy liberated by an hydrogen atom when the electron changes energy levels? [n is the quantum number]

A N = 2 to n = 1
B N = 1 to n = 2
C N = 2 to n = 3
D N = 3 to n = 2

Question 762:

A proton of wavelength \(\lambda_o\) is emitted when an electron in an atom makes a transition from a level of energy 2E_{[/sub]. If the electron transits from \(\frac{4}{3}E_k\) to E[sub]} level, determine the wavelength of the photon that would be emitted

A 3\(\lambda_o\)
B 2\(\lambda_o\)
C \(\frac{3}{4}\)\(\lambda_o\)
D \(\frac{1}{3}\)\(\lambda_o\)

Question 763:

The nucleon number and the proton number of a neutral atom of an element are 23 and 11 respectively. How many neutrons are present in the atom?

A 11
B 12
C 23
D 34

Question 764:

In a nuclear reactor, electricity can be generated through the following processes. Arrange the processes in the correct order. i. The steam is used to drive turbines. ii. The heat energy released is removed by passing water through the reactor. iii. The turbines in turn generate electricity. iv. The water then passes through some form of heat exchanger to produce steam

A Ii, iv, i and iii
B I, ii, iii and iv
C Iii, i, iv and ii
D Iv, i, iii and ii

Question 765:

The duality of matter implies that matter

A Exists as a particle of dual composition
B Has momentum and enrgy
C Has both wave and particle properties
D Is made up of dual materials