The spectral energy distribution of the sum has a maximum at 4650 Aº. It temperature of sum is 6000°K, what is the temperature of the star for which this maximum is 9402 A°.
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- The given equation shows the pressure inside a normal star. Using parameters that are appropriate to the sun, show that the kinetric pressure dominates throughout the sun (including the core, where the internal pressure is about 107 Kelvin).What is the rate of thermal radiation emitted from a star with a radius of 2.310x 109mand a surface temperatureof8,420K?Assume that the spherical surface behaves as a blackbody radiator.[Surface Area of a sphere = 4πr2; Area of a circle = πr2or (π/4)d2]If the Sun was producing its energy by slow contraction as suggested by Helmholtz and Kelvin, estimate the amount by which the radius of the Sun has to decrease every year to produce the observed luminosity.
- Why is SMF faster than MMF over large distances?What will be the energy associated with a blue photon (in Joules), if the frequency of the blue light is 650 THz (Terahertz (THz); 1 Tera – 1012y? [Hint: Use Planck's cquation: E = hf to calculate the photon energy! h - Planck's constant – 6,63 × 10-4 Js – 4.14 ×1015 eVs] A. 650×1012 J B. 6.5×10° J C. 4.3x1015 J D. 4.3×10-19 J E. 4.3x1019 J17.2 (a) Use the fact that fo [2³/(e² − 1)] dz = π¹/15 to show that the total radiant energy emitted per second by unit area of a blackbody is 27³KT4/15c²h³. Note that this quantity is propor- tional to T4 (Stefan's law). (b) The sun's diameter is 1.4 × 10⁹ m and its effective surface temperature is 5800 K. Assume the sun is a blackbody and estimate the rate of energy loss by radiation from the sun. (c) Use E mc² to calculate the relativistic mass of the photons lost by radiation from the sun in 1 year. =
- Calculate the amount of radiation emitted for a unit surface (2 m2) for black ball at 53°C and £≈0.96 Express your answer SI units (in W).Calculate minimum and maximum energies that can be associated with IR?Describe the plysical environment and processes to obtain the emission line spectra and absorption line spectra from the stars. Describe the physical environment and processes to obtain the emission line spectra and absorption line spectra from the stars. haha maintained a high
- /dsinė A beam of electrons is shot towards a material X with a crystalline structure. A diffraction pattern is observed corresponding to a distance d=0.15 nm. between two adjacent Bragg planes. The electrons are each sent in with a kinetic energy of 51.900000000000006 eV. Part a) Find the de Broglie wavelength in nanometres of an electron incident on the material X.The wavelength of the peak of the blackbody distribution was found to follow Wein’s Displacement Law. Calculate the peak wavelength of a bluish-white star that radiates at temperature 20000 K. a) 145 nm b) 100 nm c) 114 nm d) 155 nmPlease solve accurate. Thanks