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2 marksParticulate Nature of Electromagnetic Radiation

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

Energy level diagram of atomic hydrogen.

Why are the energy values of these levels negative?

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Other parts of this question

  1. 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…[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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