1. Temperature of the Cosmic Microwave Background radiation (CMB) isT= 2.725 K.a) Assuming it has a Planck energy distribution, use Wien's DisplacementLaw to find the maximum wavelength of the CMB (in metres).b) What is the radiation energy density, u (measured in J/m³) of the CMB?c) Maximum intensity of the CMB occurs at frequency vmax = 160 GHz.Calculate energy (in Joules, J) of one photon at this frequency.d) Using the results of (2) and (3), find the number of CMB photons per m3,Nph •

(a) as we know max. Wavelength of radiation given by wein displacement law Lembda = b/ T where b is…

Answered: 1. Temperature of the Cosmic Microwave…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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5. Find the momentum of (a) a 10.0-MeV gamma ray; (b) a 25-keV X ray; (c) a 1.0-um infrared photon; (d) a 150-MHz radio-wave photon. Express the momentum in kg m/s and eV/c.
Two starships, the Enterprise and the Constitution, are approaching each other head-on from a great distance. The separation between them is decreasing at a rate of 812.5 km/skm/s. The Enterprise sends a laser signal toward the Constitution. If the Constitution observes a wavelength λ=675.3nm, what wavelength was emitted by the Enterprise? Express your answer to four significant figures and include appropriate units.
l5.b Please provide a correct and well explanied solution for the following
1. Calculate the energy of a photon whose frequency is (a) 5.00×10¹4 Hz, (b) 10.0 GHz, (c) 30.0 MHz. Express your answers in electron volts.
8. Milky Way The Sun is a star in the Milky Way galaxy. When viewed from the side, the galaxy looks like a disk that is approximately 100,000 light-years in diameter (a light-year is the distance light travels in one year) and about 1000 light-years thick (Figure P25.8). What is the diameter and thickness of the Milky Way in meters? In kilometers? In miles? Figure P25.8 Galactic Longitude 75.000 ittarius Sagitt Arm Onan Perseus Arm Arm 15,000 30.000 180° Scutum-Ce 270° Sun and solar system's location in the Milky Way
2. The wavelength of maximum intensity of the sun's radiation is observed to be near 500 nm. Assume the sun to be a black-body and calculate,imsed of (a) the sun's surface temperature (b) the power per unit area (intensity) emitted from he sun's surface. (c) At what rate is the sun losing mass in units of kg/s? (Hint: What are the units from rignslavaw wert odrai Jari W (d) your answer in part (b)?) (d) At that rate, how much time would it take to exhaust the sun's fuel supply? Does your answer seem reasonable? (The sun's mass is ~2.0x1030 kg)
3) What is the wavelength of a photon in nanometers, having energy of 2.00 eV? (e-3.00 - 10 m/s, h = 6.626 x 10-34 J-s, 1 eV = 1.60 × 10-19 J) s)
1. The maximum radiance of a blackbody is at wavelength λ = 1.2 µm. a) At what temperature does this occur? b) Estimate the brightness temperature for a grey body at this wavelength if the emissivity coefficient is 0.9. (Use the full formula.) ( hc
You’re in a potions class and your friend has a bubbling cauldron of soup. You measure with a super-magic thermometer that reads 1808 K. Your skin is measured at 33 °C. Assume both examples radiate like a blackbody. a) What wavelength does the soup radiate at maximum intensity and which region of the electromagnetic spectrum does this wavelength correspond? b) Repeat part a) for your skin.
6. Two points on earth are 1500 km apart and are to communicate by means of HF. Given that this is to be a single-hop transmission, the critical frequency at that time is 7 MHz and conditions are idealized, calculate the MUF for those two points if the height of the ionospheric layer is 300 km.
6. What is the temperature of an object if the peak wavelength of its blackbody spectrum is 1200 micrometers? a. 2.4 K b. 25 K С. 322 К d. 833 K e. None of these CS Scanned with CamScanner
1. Based on Planck's theory of black body radiation, the radiant spectral emittance is given in the following equation : 2nhc² n(2) hc 25 AkgT) – 1 where lamda is the wavelength, h is Planck's constant, kB is Boltzmann's constant, c is the speed of light, and T is the temperature on the Kelvin scale. Assuming T is constant, find the optimal wavelength equation.

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