102 If one studies the thermal spectrum of Uranus (T = 57 K) and compares it...
The universe is filled with thermal radiation, which has a blackbody spectrum at an effective temperature of 2.7 K. What is the peak wavelength of this radiation? What is the energy (in eV) of quanta at the peak wavelength?
What was the temperature anomaly in Buffalo, NY on August 27 , 2019? Give your answer in °C. Answers within ±3°C of the correct answer are marked correct. The long-term average temperature for August in Buffalo is 20 °C. Using this information and your answer from Q8, what was the temperature in Buffalo on August 27, 2019? Give your answer in °C. Hotter objects emit _________ than cooler objects a. more energy at redder wavelengths b. more energy at bluer...
Construct plots that show the wavelength-dependent energy spectrum of a blackbody at a temperature of 5800 K (approx. temperature of the Sun) using both the Planck distribution and the Raleigh-Jeans distribution. Confirm agreement between the two at long wavelength. a. What is the maximum emission wavelength at this temperature? b. What is the total power output (W/m^2) ? c. Using the Planck distribution, estimate what fraction of the Sun's total power output is emitted in visible wavelengths (400-750 nm)
The electronic absorption spectrum UI (Cr(NH3)6]3+ (aq) is shown in Figure 11.5. One of the observed peaks is centered at about 303 nm. 1.a. What is the approximate value of the wavelength for the two other peaks? Which one of these three peaks falls in the visible region of the electromagnetic spectrum? The wavelength at this peak is (Amax), and this transition accounts for the color of the complex ion in solution. The energy of the transition occurring at...
2. The average person has 1.4 m2 of skin at a skin temperature of roughly 305 K (90°F) Consider the average person to be an ideal radiator standing in a room at a temperature of 293 K (68°F) (a) Calculate the power (energy per uni i) radiated by the average person in the form of blackbody radiation; express your answer in erg s-1. What is the person's "wattage"? (1 W = 107 erg s-1) Compare this to a typical incandescent...
Questions 15 through 16 pertain to the situation described below: Lithium ion Li+2 has a nucleus of charge 3e and one orbiting electron (15) What is the ionization energy of the electron? (A) 102 eV, (B) 112 eV: (C) 122 eV: (D) 132 eV: (E) 142eV (16) What is the longest wavelength in its emission spectrum if the final stat ground state? (A) 10.5nm; (B) 11.5nm; (c) 12.5 nm; (D) 13.5 nm; (E) 14.5nm 10.5 nm; Questions 15 through 16...
Useful equations: = 600nm (5000K/T) lambdamax L oCR2 T What is the peak wavelength of an O star of temperature 30,000 K? What range of the spectrum is this? 1. 2. Imagine we find a star that is 2 times the size of the Sun (in terms of its radius) but with a temperature that is identical to the Sun. What is the luminosity of this star compared to the Sun? a. The same -luminosity depends only ontemperature b. About...
ent material has the thermal conductivity k and thickness L. The temperature the material is of the form: distribution along the x-direction, T(x) in + Bx2 + C, where A, a, B, and C are constants. The irradiation is fully the material and can be characterized by a uniform volumetric heat generation, W/m3). Assuming 1D steady-state conduction and constant properties. xpressions for the conduction heat fluxes (alx) at the top and bottom surfaces; absorbed by (4 points) (b) Derive an...
32) The reaction of one mole of nitrogen gas with three moles of hydrogen gas releases 92 kJ of thermal energy to the surroundings. Which of the following is TRUE? A) This reaction has a negative enthalpy of reaction. B) Complete reaction of two moles of nitrogen gas would release 184 kJ of thermal energy in this reaction. C) This reaction is exothermic. D) All of the above are true. E) None of the above are true. 33) How many...
Which of the following regions of the electromagnetic spectrum has the highest frequency? Select one: A. Visible light B. Microwaves C. Infrared radiation D. Ultraviolet radiation onization energy is the energy required to add an electron to an atom in the gaseous state. Select one: True False In the Bohr model of the atom, the greatest energy would be emitted if an electron relaxed from the n = 5 orbit to which orbit? Select one: A. n = 2 B....