Transport of Radiant Energy - Aphy 140 Lecture 3 Quiz

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According to Wien's Law, how is the wavelength at which energy is emitted per unit wavelength related to the absolute temperature of an object?

No relation

Directly proportional

Proportional to the square root

Inversely proportional (correct)

What does Wien's Law suggest about the value of E(λ) at the wavelength λm?

Proportional to λm

Proportional to λm^5 (correct)

Not related to λm

Constant

In Stefan's Law, how is the rate of energy emission from a full radiator related to its absolute temperature?

Quadratic relationship

Proportional to the fourth power (correct)

Cubic relationship

Linear relationship

What is the Stefan-Boltzmann constant σ used for in Stefan's Law?

Quantifying the rate of energy emission from a full radiator Signup and view all the answers

According to Wien's Law, what happens to the spectra peaks of objects with different temperatures?

They shift to shorter wavelengths Signup and view all the answers

How is the value of E(λ) at the wavelength λm related to temperature according to Wien's Law?

Proportional to temperature to the power -5 Signup and view all the answers

What are the three main sources of radiation mentioned in the text?

Particles shot into space during solar flares Signup and view all the answers

Which factor does NOT affect the amount of space radiation an astronaut may be exposed to while orbiting the Earth?

Distance from the Moon Signup and view all the answers

What is the concept of 'absorptivity' related to in the context of radiation?

The fraction of incident radiation absorbed at a specific wavelength Signup and view all the answers

What is the special case when the emissivity of an object is 1 at all wavelengths?

Black body spectrum Signup and view all the answers

In what range are nearly all the radiation emitted by full radiators confined to?

$3-100$ μm Signup and view all the answers

What causes the absorptivity and emissivity of a gas to change with height in the lower atmosphere?

Pressure changes Signup and view all the answers

What is the velocity of electromagnetic radiation?

3.0 × 10^8 m/s Signup and view all the answers

Which type of radiation has enough energy to move atoms in a molecule but not enough to cause chemical changes?

Non-Ionizing Radiation Signup and view all the answers

What type of radiation is commonly used to kill cancer cells?

Gamma Radiation Signup and view all the answers

Which law describes the relationship between the temperature of an object and the wavelength at which it emits the most radiation?

Wien's Law Signup and view all the answers

What is the form of subatomic particles or waves through which ionizing radiation travels?

Photons Signup and view all the answers

Which property of radiation is used in many manufacturing processes?

Ionization Signup and view all the answers