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Physical Science, 5/e
Bill Tillery, Arizona State University

Light

Exercises

  1. What is the speed of light while traveling through (a) waterAnswer and (b) iceAnswer?
  2. How many minutes are required for sunlight to reach the earth if the sun is 1.50 x 108 km from the earth? Answer
  3. How many hours are required before a radio signal from a space probe near the planet Pluto reaches Earth, 6.00 x 109 km away? Answer
  4. A light ray is reflected from a mirror with an angle 10° to the normal. What was the angle of incidence? Answer
  5. Light travels through a transparent substance at 2.20 x 108 m/s. What is the substance? Answer
  6. The wavelength of a monochromatic light source is measured to be 6.00 x 1027 m in a diffraction experiment. (a) What is the frequency?Answer (b) What is the energy of a photon of this light? Answer
  7. At a particular location and time, sunlight is measured on a 1 square meter solar collector with an intensity of 1,000.0 W. If the peak intensity of this sunlight has a wavelength of 5.60 x 1027 m, how many photons are arriving each second? Answer
  8. A light wave has a frequency of 4.90 x 1014 cycles per second. (a) What is the wavelength?Answer (b) What color would you observe (see Table 8.2)? Answer
  9. What is the energy of a gamma photon of frequency 5.00 x 1020 Hz? Answer
  10. What is the energy of a microwave photon of wavelength 1.00 mm? Answer