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 3.45×10 Hz and 6.53×10 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?

  • A3.10×10 J
  • B3.25×10 J
  • C1.77×10 J
  • D2.83×10 J
  • E2.39×10 J

Q3:

A microwave oven emits photons with a frequency of 3.0×10 Hz. Calculate the energy of one emitted photon.

  • A2.0×10 J
  • B1.0×10 J
  • C3.2×10 J
  • D6.6×10 J
  • E1.2×10 J

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