Thermal Energy Transfer Quiz

According to the Stefan-Boltzmann law, the power radiated by a black body is proportional to the fourth power of what?

• The body's mass

• The body's surface area

• The absolute temperature of the surface

• The intensity of incident radiation

What is the term used to describe the specific wavelength at which the peak of the black-body spectrum occurs?

• Critical wavelength

• Peak wavelength

• Maximum wavelength

• Dominant wavelength

According to Wien's law, what is the approximate peak wavelength of the emitted radiation from a human body at 37 °C?

• 9 x 10^-6 m

• 1 x 10^-5 m

• 5 x 10^-7 m

• 2.90 x 10^-3 m

What is the peak wavelength of the emitted radiation from the earth's surface at an average temperature of 288 K?

• 9 x 10^-6 m

• 1 x 10^-5 m

• 5 x 10^-7 m

• 2.90 x 10^-3 m

For the sun at a temperature of 5800 K, what is the peak wavelength of the emitted radiation?

• 9 x 10^-6 m

• 1 x 10^-5 m

• 5 x 10^-7 m

• 2.90 x 10^-3 m

By what factor does the power emitted by a black body increase when the temperature is increased from 100 °C to 200 °C?

• 2.59

• 1.5

• 3.0

• 2.0

What do you understand by the term "black body"?

• A. A perfect emitter and absorber of radiation

• B. A body that reflects all radiation

• C. A body that transmits all radiation

• D. A body that absorbs no radiation

Which of the following is a good approximation of a black body?

• A. The Sun

• B. A wooden block

• C. A mirror

• D. A white wall

What is the surface temperature of a star that radiates like a black body and most of its energy is emitted at a wavelength of 410 nm?

• A. 7073 K

• B. 6050 K

• C. 5000 K

• D. 3500 K

Which star has a higher surface temperature, Star X with a peak wavelength of 480 nm or Star Y with a peak wavelength of 560 nm?

• A. Star X

• B. Star Y

• C. Both have the same temperature

• D. Cannot be determined