Worksheet: Converting between Energy and Frequency

In this worksheet, we will practice using the Planck constant to convert between energies and frequencies of electromagnetic waves.

Q1:

The atomic emission spectrum of cesium contains lines at frequencies of 3 . 4 5 × 1 0 Hz and 6 . 5 3 × 1 0 Hz. Calculate the difference in energy between these two lines.

Q2:

The combined energy of two photons is equal to that of one photon with a wavelength of 381 nm. The frequency of one photon is 360 THz. What is the energy of the second photon?

  • A 2 . 8 3 × 1 0 J
  • B 3 . 1 0 × 1 0 J
  • C 3 . 2 5 × 1 0 J
  • D 2 . 3 9 × 1 0 J
  • E 1 . 7 7 × 1 0 J

Q3:

A microwave oven emits photons with a frequency of 3 . 0 × 1 0 Hz. Calculate the energy of one emitted photon.

  • A 1 . 2 × 1 0 J
  • B 2 . 0 × 1 0 J
  • C 1 . 0 × 1 0 J
  • D 3 . 2 × 1 0 J
  • E 6 . 6 × 1 0 J

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