The intensity of blackbody radiation peaks at a wavelength of 523 nm. (a) What is the temperature (in K) of the radiation source? (Give your answer to at least 3 significant figures.) K (b) Determine the power radiated per unit area (in W/m2) of the radiation source at this temperature. |W/m2
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- A small satellite is in orbit around the Earth at a height of 1500 km above the surface. It has a mass of 100 kg, a diameter of 1 m, an absorptivity of 0.8 for IR radiation and 0.4 for visible radiation. a) What solid angle does the Earth subtend when viewed from the satellite? b) Calculate the radiative equilibrium temperature of the satellite when it is in the shadow of the Earth. c) What is the radiative equilibrium temperature of the satellite at the moment when it passes completely out of the shadow of the Earth? (Note that at this time the Earth is still completely dark when viewed from the satellite.)Daylight and incandescent light may be approximated as a blackbody at the effective surface temperatures of 5800 K and 2800 K, respectively. Determine the wavelength at maximum emission of radiation for each of the lighting sources.According to the Bohr model of a hydrogen atom, the frequency of light radiated by an electron moving from an orbit ₁ to an orbit n₂ corresponds to the energy level difference between ₁ and ₂ of where E = Eo ( − 2) - mez²4 32x²² Eo and where me is the electron mass, Z is the atomic number, e is the magnitude of the electron charge, is the permittivity of free space, and ħ is Planck's constnt divided by 27. In the case of hydrogen (Z = 1) Eo = -13.6 eV. == Part A Find the frequency of light f radiated by an electron moving from orbit ₁2 to n₂ = 1 inside of a He+ ion. Express your answer in hertz to three significant figures. ► View Available Hint(s) f= 15| ΑΣΦ Submit Part B ? Hz
- Suppose a hot object radiates with the twice the intensity as the sun on earth, i.e. 2600W/m2. What is the energy density of this radiation?Fused quartz transmits 90 percent of the incident thermal radiation between 0.2 and 4 µm. Suppose a certain heat source is viewed through a quartz window. What heat flux in watts will be transmitted through the material from blackbody radiation sources at (a) 800◦C, (b) 550◦C, (c) 250◦C, and (d ) 70◦C?A cavity radiator has its maximum spectral radiance at a wavelength of 2,5×10-7 m. If the body is heated so that T/T0 = 5,5, what will be the ratio of radiant powers W/W0? Wien's constant b = 2.897 ×10-3 m·K.
- The energy flux from the sun has a peak value of around 1500 W/m2, and solar cells are around 15% efficient. Estimate the area needed to satisfy US energy needs using solar cells, using the estimates that there are about 350 million people in the US and that we use an average of 90 kW/person. Also assume that there are about 6 hours of "peak" sunlight per day. Answer in square kilometers (do not put units in your answer, however).Suppose you measure spectrum of a 40W incandescent light bulb which peaks at a wavelength of 576 nm. Using Wein's displacement law, (eq 1 given above) find the temperature of the source. Using the temperature you found in 1, find the surface area of the 40 W light bulb (use equation 2 assuming ɛ =1 and make a reasonable assumption on temperatures for this calculation. Also, use o = 5.67 x 108 W/m²K*). Determine the energies of the following transitions in the hydrogen atom: n = 5 to n= 2, n= 4 to n= 2, n= 3 to n=2 (Hint: Find the change in energy using equation (4)) Find the wavelength (in nm) of each transition you found in question no.3 (Hint: use formula for energy of photon E = hc/h)Two long parallel 20-cm-diameter cylinders are located 30 cm apart from each other. Both cylinders are black, and are maintained at temperatures 425 K and 275 K. The surroundings can be treated as a blackbody at 300 K. For a 1-mlong section of the cylinders, determine the rates of radiation heat transfer between the cylinders and between the hot cylinder and the surroundings.
- A dielectric material has an absorption coefficient of 0.25 cm−1. A plate of thickness 3 cm is made from this material, and light with intensity 20 W m−2 is incident on the front. Ignoring reflection losses, calculate the intensity transmitted through the plate.Give your answer as a decimal to 2 d.p.(a) The blackbody radiation emitted from a furnace peaks at a wavelength of 4.5 10-6 m (0.0000045 m). What is the temperature inside the furnace? (in K) (b) The charger cord used to recharge a cell phone contains a transformer that reduces 120 V AC to 4 V AC. For each 1,400 turns in the input coil, how many turns are there in the output coil? (Round your answer to at least one decimal place.)Problem 7: You place your ear onto a steel railroad track and hear the sound of a distant train through the rails At = 2.6 seconds before you do through the air. The speed of sound in steel is v, 6100 m/s, and and the air temperature is 24.5° C. Find the distance, D, to the train in meters. D= sin() cotan() cos() asin() atan() acotan() cosh() tan() ♫ ( acos() sinh() tanh() cotanh() Degrees O Radians Hints: 2% deduction per hint. Hints remaining: 2 Submit Hint 7 8 4 5 2 0 BACKSPACE EMA + - VO Feedback 9 6 3 HOME END CLEAR I give up! Feedback: 2% deduction per feedback.