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68111055-1-5-Problemsandquestions1

# 68111055-1-5-Problemsandquestions1 - Problems and Questions...

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Problems and Questions 1. What is the size of a bacteria, a large molecule, atom, nucleus, electron and quark? 2. Describe electromagnetic spectrum. 3. Calculate the energy in electron volts of a photon having a wavelength in (a) the microwave range, 5.00 cm; (b) the visible light range, 500 nm; and (c) the x-ray range, 5.00 nm. 4. Explain Planck’s radical assumption on the light. 5. Are blackbodies black? 6. All objects radiate energy. Why, then, are we not able see all objects in a dark room? 7. Radiation has been detected from space that is characteristic of an ideal radiator at T=2.728 K (Relic from “Big - Bang”). For this temperature at what wavelength does the Plank distribution peak? In what part of the electromagnetic spectrum is this wavelength? Answer: 1.06 μ m, microwave 8. A clean nickel surface is exposed to light of wavelength of 235nm. What is the maximum speed of the photoelectrons emitted from this surface. The work function for nickel is =5.1 eV. Answer: 2.5x10 5 m/s 9. The threshold of dark-adapted (scotopic) vision is 4.0x10 -11 W/m2 at acentral wavelength of 500 nm. If light with this intensity and wavelength enters the eye when the pupil is open to its maximum diameter of 8.5 mm, how many photons per second

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