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2 marksParticulate Nature of Electromagnetic Radiation

CAPE Physics Unit 2 · 2001 · Paper 1 · Question 7(b)(i)

An incoming electron of kinetic energy 20.0 × 10⁻¹⁹ J collides inelastically with the hydrogen electron in its ground state. Indicate, by means of vertical arrows on the left side of the energy level diagram, possible transitions of the hydrogen electron which can occur as a result of this collision.

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Other parts of this question

  1. 7(a)Why are the energy values of these levels negative?[2 marks]
  2. 7(b)(ii)What becomes of the incident electron?[1 mark]
  3. 7(c)(i)An incoming photon of wavelength 1.02 × 10⁻⁷ m collides with a similar hydrogen electron in its ground state also. Calculate the energy of this photon.[2 marks]
  4. 7(c)(ii)Indicate on the right side of the energy level diagram the possible level(s) to which the absorbing electron rises.[1 mark]
  5. 7(c)(iii)What becomes of the incident photon?[1 mark]
  6. 7(c)(iv)State what would be the case in (c)(i) if the photon had a shorter wavelength of 0.95 × 10⁻⁷ m.[1 mark]

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