Page 720 - SUBSEC October 2017_Neat
P. 720
- 16 -
3. (a) (i) State what is meant by ‘ware-particle duality’.
DO NOT WRITE IN THIS AREA
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
[2 marks]
(ii) Write the de-Broglie equation.
...........................................................................................................................
...........................................................................................................................
DO NOT WRITE IN THIS AREA
[1 mark]
(b) Sodium has a work function of 2.2 eV. Find
(i) its threshold wavelength
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
[2 marks]
(ii) the maximum energy of the photoelectrons when the metal is illuminated by
light of wavelength 4 x 10 m
-7
DO NOT WRITE IN THIS AREA
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
[2 marks]
GO ON TO THE NEXT PAGE
02238020/CAPE/SPEC 2017
‘‘*’’Barcode Area”*”
Sequential Bar Code
