{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

68111055-1-5-Problemsandquestions1

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

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern