You are looking at 2 heated metal pieces. One looks red and the other looks green. Which one is hotter? Explain.
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You are looking at 2 heated metal pieces. One looks red and the other looks green. Which one is hotter? Explain.
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- 4. In an experiment on the photoelectric effect, a metal is illuminated by visible light of different wavelengths. A photoelectron has a maximum kinetic energy of 0.9 eV when red light of wavelength 640 nm is used. With blue light of wavelength 420 nm, the maximum kinetic energy of the photoelectron is 1.9 eV. Use this information to calculate an experimental value for the Planck constant h. [8 How does looking at light from distant objects help us predict the temperature of the object? A The light spectrum of the distant object tells us what the object is made of and therefore tells us its temperature. B C D The shape of the object's continuous spectrum tells us its temperature. We can infer the temperature of the object by comparing the spectrum of the object's light with a laboratory spectrum of lines at rest. By estimating the Doppler shift of the object, we can estimate its temperature.F= k 1, n Y(m) electan 8.98 x10? %3D 1.6 X1U c) ro [S-21x16-" X(m) proten' = + 1.6 x15c to the magnitude g He forcel Calculete
- In relation to incoming radiation, which surface would receive the most heat? a. the surface that is perpendicular to the radiation b. the surface that is parallel to the radiation c. the surface that is angled towards the radiation d. the surface that is angled away from the radiation65 N 45 P 56 N 30% C 60° 52 N P PearsonA photon of light has a frequency of 5.00 x 1014 Hz. If the frequency of the photon was doubled then which of these would happen to the energy of this photon? a. it would become one-fourth as much b. it would become half as much c. it would double d. it would quadruple e. it would triple