Consider the spectral emittance for radiation from a blackbody at T=1500 K. Take an oscillator that emit photons with a wavelength of 5 micrometer and another oscillator that emit photons with a wavelength 0.5 micrometer.
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- Two stars, both of which behave like ideal blackbodies, ra- diate the same total energy per second. The cooler one has a surface temperature T and a diameter 3.0 times that of the hotter star. (a) What is the temperature of the hotter star in terms of T ? (b) What is the ratio of the peak-intensity wavelength of the hot star to the peak-intensity wavelength of the cool star?After experiencing an inelastic collision with an electron, a photon underwent a change in wavelength equal to 2.35 x 10^-13 meters. At what angle did the photon scatter after the collision?Two stars, both of which behave like ideal blackbodies, radiate the same total energy per second. The cooler one has a surface temperature T and 4.0 times the diameter of the hotter star. What is the temperature of the hotter star in terms of T?
- Suppose a star with radius 8.57 × 108 m has a peak wavelength of 680 nm in the spectrum of its emitted radiation. (a) Find the energy of a photon with this wavelength. J/photon (b) What is the surface temperature of the star? K (c) At what rate is energy emitted from the star in the form of radiation? Assume the star is a blackbody (e = 1). W (d) Using the answer to part (a), estimate the rate at which photons leave the surface of the star. photons/sConsider a blackbody radiator at a temperature of 5000 K. Calculate the peak wavelength of the radiation emitted by the blackbody.An electron of mass 9.11 × 10−31 kg and a bowling ball of mass 6.00 kg each have 4.50 eV of kinetic energy. Calculate the de Broglie wavelength of the electron: Calculate the wavelength of a 4.50 eV photon:
- For light with a wavelength of 350 nm and with an intensity of /= 10-8 W/m², what is the number of photons/(m²s) in the light beam?The momentum of light, as it is for particles, is exactly reversed when a photon is reflected straight back from a mirror, assuming negligible recoil of the mirror. The change in momentum is twice the photon’s incident momentum, as it is for the particles. Suppose that a beam of light has an intensity I and falls on an area A of a mirror and reflects from it. Er = I A t p = 2 ( I A t )/c Use Newton’s second law to write an equation for the force on the mirror for time t. Use the variables along with c for the speed of light.A photon with an energy of 2.28 eV is barely capable of causing a photoelectric effect when it strikes a sodium plate. Suppose the photon is instead absorbed by hydrogen. Find the minimum n for a hydrogen atom that can be ionized by such a photon
- The Earth has an average surface temperature of 288K and the Sun has an average surface temperature of 5800K. Assume them to be black bodies. If the only radiation that either black body emitted was at it's peak wavelength how many more photons would Earth need to radiation than receive in order for the climate to be stable.Calculate the energy of a photon of frequency 3.5 x 1015 Hz, in electronvolts (eV). Do an online search to find the conversion factor between electronvolts and joules.No photoelectrons are emitted from tungsten unless the wavelength of incoming light is less than 270 nm. If an experiment requires electrons with a maximum kinetic energy of 2.0 eV, what frequency of light should be used to illuminate the tungsten?