1. How does the energy of a photon compare with the difference in energylevels of the atom from which it is emitted?Excited energy levels (S₁)MMLaserGround energy level (So)Your answerFluorescencewww23ElectronNucleus°

The energy of a photon emitted by an atom is intrinsically linked to the difference in energy levels…

Answered: 1. How does the energy of a photon…

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter27: Quantum Physics

Section: Chapter Questions

Problem 19P

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To get an idea of how empty deep spam is on the average, perform the following calculations: (a) Find the volume our Sun would occupy if it had an average density equal to the critical density of thought necessary to halt the expansion of the universe. (b) Find the radius of a sphere of this volume in light years. (c) What would this radius be if the density were that of luminous matter, which is approximately 5% that of the critical density? (d) Compare the radius found in part (c) with me 4-ly average separation of stars in the aims of the Milky Way.
What aspect of the blackbody spectrum forced Planck to propose quantization of energy levels in its atoms and molecules?
Give an example of a physical entity that is quantized. State specifically what the entity is and what the limits are on its values.
As2. A planet orbits a red dwarf star of radius r0 at a distance of 120r0. In- telligent beings on this planet observe that the radiation from their star arriving at the top of their atmosphere is 1100W/m2. Assume the star’s radiation follows Planck’s law for black body radiation. a) What is the temperature of the star’s surface, within 10K accuracy? b) What is the color of the star’s light? This would correspond to the frequency at which the function B(ν, T) is maximal.
1. What is the energy of a photon of yellow light (A = 550 nm)? How big is this in comparison to the energy released every second by a standard 60W light bulb? How does this explain why we don't detect the quantization of light in the everyday world?
1.What is the wavelength of an hydrogen atom moving with a mean velocity corresponding to the average kinetic energy of hydrogen atoms under thermal equilibrium at 293K? 2.The speed of an electron is measured to be 1 km/s with an accuracy of 0.005%. Estimate the uncertainty in the position of the particle 3.Determine the maximum wavelength shift in the Compton scattering of photons from protons 4.Calculate the de Broglie wavelength of electrons and protons if their kinetic energies are i) 1% and ii) 5% of their rest mass energies.
Answer= 11. Calculate the uncertainty in the speed of a ball of mass 500 g that is known to be within 1.0 um of a certain point on a bat. 12. The Planck distribution gives the energy in the wavelength range da at the wavelength A. Calculate the energy density in the range fro 650 nm to 655 nm inside a cavity of volume 100cm³" when the temperatura in 25 C
State following statements whether TRUE or FALSE. of met turi vii. Failure of Rayleignca Wien displacement law suggested that an oscillatory atom could absorb or emit energy only in discrete bundles. ix. Olraviorer CaLastropn. viii. Compton Effect is interaction of radiation with matter. Photoelectric effect does not work on free electrons. х.
The predominant wavelength emitted by an ultraviolet lamp is 300 nma) What is a frequency of this light?b) What is the energy (in joules) of a single photon of this light?c) If the total power emitted at this wavelength is 25.0 W, how manyphotons are emitted per second?
When an electron moves from the n=5 orbit to the n=4 orbit of a hydrogen atom, a photon of light is emitted a. What is the energy of this photon, in joules? b. What is the frequency of this radiation, in hertz? c. What is the wavelength of this radiation, in nanometers?
1. An incoming light beam has frequency 9.7 x 1014 Hz. (Use h=6.626 x 10-34 J.s) a.) How much energy in Joules does it have? b.) If the photons of this light beam are absorbed by a free electron, how much kinetic energy and speed will the free electron have?
Thermal neutrons are produced by a fission nuclear reactor. The temperature of the neutrons is about room temperature, T 2 299 K. The kinetic energy of the neutron is E = kgT, where kp = 1.38 x 10–23 J/K is the Boltzmann constant. The mass of a neutron is m, = 1.67 x 10-27 kg. Part 1) Calculate the de Broglie wavelength of a thermal neutron. nm Part 2) The highest energy photons ever observed are y-rays with energies up to 311 trillion electron volts, Ey = 311 × 102 eV. The rays come from the Crab nebula, the remnant of a supernova explosion. Calculate the wavelength of these photons. m Part 3) A position uncertainty of an electron in a hydrogen atom is about size of the atom, which is Aæ = 0.500 Å = 0.500 × 10–10 m. Using the Heisenberg uncertainty relation, Ap Ax = , calculate the related kinetic energy (zero motion energy): (Ap? 2m E = 2m The electron mass is m = :0.910 x 10-30 kg. E eV

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1. How does the energy of a photon compare with the difference in energy levels of the atom from which it is emitted? Excited energy levels (S₁) MM Laser Ground energy level (So) Your answer Fluorescence www 2 3 Electron Nucleus °