6.1 Electromagnetic Energy

The light produced by a red neon sign is due to the emission of light by excited neon atoms. Qualitatively describe the spectrum produced by passing light from a neon lamp through a prism.

FM-95, an FM radio station, broadcasts at a frequency of 9.51 $\times$ 10⁷ s⁻¹ (95.1 MHz). What is the wavelength of these radio waves in meters?

Light with a wavelength of 614.5 nm looks orange. What is the energy, in joules, per photon of this orange light? What is the energy in eV (1 eV = 1.602 $\times$ 10⁻¹⁹ J)?

A photon of light produced by a surgical laser has an energy of 3.027 $\times$ 10⁻¹⁹ J. Calculate the frequency and wavelength of the photon. What is the total energy in 1 mole of photons? What is the color of the emitted light?

The emission spectrum of cesium contains two lines whose frequencies are (a) 3.45 $\times$ 10¹⁴ Hz and (b) 6.53 $\times$ 10¹⁴ Hz. What are the wavelengths and energies per photon of the two lines? What color are the lines?

One of the radiographic devices used in a dentist's office emits an X-ray of wavelength 2.090 $\times$ 10⁻¹¹ m. What is the energy, in joules, and frequency of this X-ray?

RGB color television and computer displays use cathode ray tubes that produce colors by mixing red, green, and blue light. If we look at the screen with a magnifying glass, we can see individual dots turn on and off as the colors change. Using a spectrum of visible light, determine the approximate wavelength of each of these colors. What is the frequency and energy of a photon of each of these col…

What is the threshold frequency for sodium metal if a photon with frequency 6.66 $\times$ 10¹⁴ s⁻¹ ejects an electron with 7.74 $\times$ 10⁻²⁰ J kinetic energy? Will the photoelectric effect be observed if sodium is exposed to orange light?