Paper 2 · Work, Energy and Power
Using the energy level diagram (Fig. 7.1), where n=1 is at -16.64×10^-19 J and n=4 is at -2.56×10^-19 J, calculate the energy required to raise an electron from n=1 to n=4.
Model answer
1.408×10^-18 J
Also accepted: 1.41×10^-18 J, 14.08×10^-19 J, 1.4×10^-18 J, 1.408e-18 J
Explanation: ΔE = E4-E1 = (-2.56×10^-19) - (-16.64×10^-19) = 14.08×10^-19 J = 1.408×10^-18 J.
Derived from ZIMSEC Physics Paper 2, November 2002, Q7