Page 562 - SUBSEC October 2017_Neat

UNIT 2
MODULE 3: ATOMIC AND NUCLEAR PHYSICS (cont’d)

SPECIFIC OBJECTIVES EXPLANATORY NOTES SUGGESTED PRACTICAL
ACTIVITIES

Particulate Nature of Electromagnetic Radiation (cont’d)

Students should be able to:

1.5. define: Φ = hf
0

(a) work function (Φ);

(b) threshold frequency
(fo);

(c) cut-off wavelength
(λo); and,

(d) stopping potential
(Vs);

1.6. use the relationship Or hf = Φ + eV
s
1
2
hf = Φ + mv
2 Explanation of why the
maximum photoelectric
to solve problems; energy is independent of
intensity, whereas the
photoelectric current is
proportional to
Intensity.

1.7. use the electron-volt as a Students should be familiar
unit of energy; with calculations for
converting the KE of
particles to eV.

1.8. explain the principles of the Include the fact that the
production of X-rays by emission spectrum has a
electron bombardment of a continuous background
metal target; component and several line
spectra series. Description
of the main features of a
modern X-ray tube,
including control of the
intensity.

1.9. explain the origins of line and Include the absorption or
continuous X-ray spectra; release of energy due to
movement of electrons
between energy levels.
Include ℎ = − .
1
2

CXC A16/U2/17 62