What is an example of a Planck's constant practice problem?

1 Answer
Meave60
May 23, 2015

Planck's constant, "h", can be used to find the energy of a photon of electromagnetic radiation. The equation is #E=hnu#, where #E# is energy in Joules (J), #h# is Planck's constant, #6.626xx10(-34) J*s#, and #nu# is the frequency. The unit for frequency is Hertz (Hz), and #"1 Hz="1/s"# .

Practice Problem

The energy of a photon of red light is #2.84xx10^(-19) "J"#. What is it's frequency?

Solve the equation #E=hnu# for #nu#.

#nu=E/h# =

#(2.84xx10^(-19) cancel"J")/(6.626xx10(-34) cancel"J*s")=(4.29xx10^(14))/("s")=4.29xx10^(14)"Hz"#

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