Q26 · 2023 · Paper 1Simple familiar4 marks
QUESTION 26 (4 marks)
Calculate the energy (in electron volts) of a photon with a wavelength of 405 nm. Show your working.
WORKED SOLUTION
4 marksQCAA guide · typeset solution
ANSWER
See worked solution below.
Worked solution
Sample response The
°re
fat of
a
° pr
__ 3x10° it
~ 405x10° “ce
14 «cc
=7.41x10" Hz
E=hf
= 6.626x10™ x7.41x10"
=4.91x10" J
=3.07 eV
Energy = 3.07 eV (to three significant figures)
e recognises the scenario relates to conversion
of wavelength to frequency [1 mark]
• provides appropriate mathematical reasoning
[1 mark]
e calculates the energy of photon [1 mark]
• converts energy into eV [1 mark]
One QCAA sample method typeset for web; criterion wording is adapted from the official marking guide.
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