6.1.5. Radiation has been detected from space that is characteristicof an ideal radiator at T = 2.728 K. (This radiation is a relic of theBig Bang at the beginning of the universe.) For this temperature, atwhat wavelength does the Planck distribution peak? In what part ofthe electromagnetic spectrum is this wavelength?%3D

The Planck distribution function is given by,

Answered: 6.1.5. Radiation has been detected from…

Modern Physics

3rd Edition

ISBN:9781111794378

Author:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Publisher:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Chapter16: Cosmology

Section: Chapter Questions

Problem 10P

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To a good approximation, the sun’s surface is a blackbody with a surfacetemperature of 5300 K. (a) At what wavelengthdoes the sun emit most strongly? (b) What is the total radiated powerper unit surface area?
Imagine another universe in which the value of Planck’s constant is 0.0663 J . s, but in which the physical laws and all other physical constants are the same as in our universe. In this universe, two physics students are playing catch. They are 12 m apart, and one throws a 0.25 kg ball directly toward the other with a speed of 6.0 m/s. (a) What is the uncertainty in the ball’s horizontal momentum, in a direction perpendicular to that in which it is being thrown, if the student throwing the ball knows that it is located within a cube with volume 125 cm3 at the time she throws it? (b) By what horizontal distance could the ball miss the second student?
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Radiation has been detected from space that is characteristic of an ideal radiator at T = 2.728 K. (This radiation is a relic of the Big Bang at the beginning of the universe.) For this temperature, at what wavelength does the Planck distribution peak? In what part of the electromagnetic spectrum is this wavelength?
Consider an electron in an infinite potential well size of a=0.1 nm. What is the ground energy of the electron? What is the energy required to put the electron at the third energy level?Calculate the wavelength of the photon that would provide this required energy? (Planck’s constant =6.6x10-34 J.s, electron mass = 9,11x10-31 kg)
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For an electron to escape from the surface of aparticular metal, it needs to absorb a minimum of6.75x10-19J of energy. Calculate the a) frequency b) wavelengthof a photon with just enough energy to cause this.
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