Blackbody Radiation

Multiple Choice

What are the properties of a black body radiator?

• A black body only emits radiation at specific wavelengths.
• A black body reflects all radiation perfectly.
• A black body radiator absorbs all radiation.

• A black body does not absorb any radiation.

Multiple Choice

Based on Wien's law, when the temperature increases, ....

• A. There is no change in the wavelength

• B. The wave length will increase

• C. The wavelength will decrease

• D.The frequency will increase

• E. The frequency will decrease

Multiple Choice

Blackbody curves also tell astronomers about the ___ of an object (like a star).

• rotational energy

• temperature

• distance

• composition

Multiple Choice

In the simulation, as you go from low temperature objects (like the Earth) to high temperature objects (like the star Sirius A), what happens to the color produced?

• It transitions from not emitting light, to emitting red light, green, and lastly blue.

• It transitions from emitting blue light (the Earth), to emitting red light, then yellow, and lastly violet / blue.

• Objects go from being blue to green to red as they heat up.

Multiple Choice

A blackbody curve on a graph tells us how an object releases

• radio waves according to Planck's constant.

• light through a black hole's event horizon.

• radiation over different frequencies.

• heat over time.

Multiple Choice

Which of the following colors indicates the hottest temperature of an object?

• Yellow
• Blue or Violet
• Green
• Red

Multiple Choice

Which of the following colors indicates the coldest temperature of an object?

• red
• green
• blue or violet
• yellow

Multiple Choice

The teacher gave Carly a list of four stars of different colors. Carly used the graph shown above to help compare the stars’ luminosity. 
Which star is going to have the highest temperature? 

• Yellow
• White
• Red
• Blue

Multiple Choice

What color would this object glow if it were heated to 5,000 K?

• Green

• Yellow

• Red

• Infrared

Multiple Choice

What is the problem with the theoretical prediction of the black body's behavior as its temperature increases?

• The prediction is only valid for non-black body objects.
• It suggests that intensity increases indefinitely with temperature.
• The prediction accurately describes the behavior at all frequencies.
• The theory predicts that the intensity of the emitted light becomes infinite as the wavelength decreases.

Multiple Choice

When the temperature of black body radiation is decreased, the maximum intensity of the radiation will...

• Shift to the longer wavelength

• Shift to the higher frequency

• There is no change

• Shift to the shorter wavelength

Multiple Choice

Two stars A and B emit the same amount of light. The wavelength that star A emits is longer than the wavelength that star B emits. What can you conclude from that explanation?

• The frequency of star A is higher than star B

• The frequency of star B is higher than star A

• The temperature of star A and star B is the same

• The temperature of star A is higher than star B

• The temperature of star A is lower than star B

Multiple Choice

Which object has the highest temperature?

• A

• B

• C

• D

• F

Multiple Choice

What discrepancy between experiment and theory helped lead Max Planck to his quantum theory?

• The ultraviolet catastrophe

• The stability of atomic orbits.
• The photoelectric effect in metals.
• The behavior of gases at high temperatures.

Multiple Choice

What is the frequency of a photon that has an energy of 5.53 x 10-19 J?

• 7.50 x 10^14 Hz
• 9.00 x 10^14 Hz
• 6.25 x 10^14 Hz
• 8.34 x 10^14 Hz

Multiple Choice

What is the energy of a photon with a frequency of  5.00 x 10^22 Hz?

• 2.500 x 10^-11 J
• 1.200 x 10^-10 J
• 3.32 x 10^-11 J

• 4.000 x 10^-11 J

Multiple Choice

What is the wavelength of a photon with an energy of    5.00 x 10-11 J?

• 1.5000 x 10^-22 m
• 2.0000 x 10^-24 m
• 3.98 x 10^-15

• 3.2500 x 10^-21 m

Multiple Choice

If the wavelength of a photon is cut in half, what is the new value of its energy in terms of its original energy?

• E/2
• 2E
• 4E
• E