A body in a room at 300 K is heated to 3,000 K. The wavelength of the most intense EM radiation emitted by the body at 3,000 K is the wavelength of the most intense EM radiation at 300 K.

Consider a blackbody radiator at a temperature of 5000 K. Calculate the peak wavelength of the radiation emitted by the blackbody.

Which of the following is the Kelvin Planck statement? a) Heat from a cold reservoir cannot be transferred to a hot reservoir without external work b) Efficiency for a reversible cyclic process can be 1 c) Heat from a hot reservoir can be completely converted into work if process is reversible d) Efficiency of a heat engine is less than 1

5. Calculate the total power radiated per unit area by a tungsten filament at a temperature of 3000. K. (Assume that the filament is an ideal radiator.) (b) If the tungsten filament of a lightbulb is rated at 75.0 W, what is the surface area of the filament? (Assume that the main energy loss is due to radiation.)

As noted in the chapter, the cosmic microwave background radiation fits the Planck equation for a blackbody at 2.7 K. (a) What is the wavelength at the maximum intensity of the spectrum of the background radiation? (b) What is the frequency of the radiation at the maximum? (c) What is the total power incident on Earth from the background radiation

Assume the sun to be a black body at temperature 5800 K. Find. (a) the total energy emitted by sun per second. (b) the rate at which energy is reaching the top of earth's atmosphere.

True or False: The peak wavelength of radiation emitted by a black body is inversely proportional to its temperature.

When the frequency associated with an energy change of hydrogen is 6.167 x 1014 cycles/s and the final energy level is 4, what is the initial energy      level      and      the      wavelength      of      light      emitted.

A large cavity that has a very small hole and is maintained at a temperature T is a good approximation to an ideal radiator or blackbody. Radiation can pass into or out of the cavity only through the hole. The cavity is a perfect absorber, since any radiation incident on the hole becomes trapped inside the cavity. Such a cavity at 500 .C has a hole with area 5.00 mm?. How long does it take for the cavity to radiate 300 J of energy through the hole?

A rectangular metal plate measures 0.24 m long and 0.7 m wide. The plate is heated to a temperature of 1,533 K by passing a current through it. Assuming that it behaves like a blackbody, how much power does the plate radiate under these conditions?