Chapter 9

Light that has a frequency of about \(5.00 \times 10^{14} \mathrm{Hz}\) (a wavelength of about \(600 \mathrm{nm}\) ) appears orange to our eyes. What is the energy in joules of the photons associated with this light?

The human eye is most sensitive to yellow-green light having a frequency of about \(5.45 \times 10^{14} \mathrm{Hz}\) (a wavelength of about \(550 \mathrm{nm}\) ). What is the energy in joules of the photons associated with this light?

Photons of a certain ultraviolet light have an energy of \(6.63 \times 10^{-19} \mathrm{J}\). (a) What is the frequency of this UV light? (b) Use \(\lambda=c / f\) to calculate its wavelength in nanometers (nm).

Photons of a certain infrared light have an energy of \(1.75 \times 10^{-19}\) J. (a) What is the frequency of this IR light? (b) Use \(\lambda=c / f\) to calculate its wavelength in nanometers (nm).

What is the radius in \(\mathrm{nm}\) of the electron orbit of a hydrogen atom for \(n=2 ?\)

What is the energy in eV of the electron of a hydrogen atom for the orbit designated \(n=2 ?\)

What is the energy in eV of the electron of a hydrogen atom for the orbit designated \(n=4 ?\)

Calculate the de Broglie wavelength of a 0.55-kg tennis ball moving with a speed of \(45 \mathrm{m} / \mathrm{s}\) (abou\(100 \mathrm{mi} / \mathrm{h})\)