Exploring Black Body Radiation

What is a black body in the context of thermal radiation?

• A black body is an idealized object that absorbs all radiation and emits thermal radiation based on its temperature.

• A black body emits radiation only when it is in motion.

• A black body reflects all radiation and does not emit thermal radiation.

• A black body is a perfect insulator that prevents any heat transfer.

How does the temperature of a black body affect its emitted spectrum?

• The temperature of a black body has no effect on its emitted spectrum.

• A black body emits more energy at lower temperatures.

• Increasing temperature decreases the total energy emitted.

• The temperature of a black body affects its emitted spectrum by shifting the peak wavelength to shorter wavelengths and increasing the total energy emitted.

What is the formula for Wien's Displacement Law?

• λ_max = b * T

• λ_max = T + b

• λ_max = T / b

• λ_max = b / T

Explain the significance of the peak wavelength in a black body spectrum.

• The peak wavelength determines the color of the black body.

• The peak wavelength is constant regardless of temperature.

• The peak wavelength has no relation to the energy emitted by the black body.

• The peak wavelength indicates the temperature of a black body and is inversely related to it.

What does Stefan-Boltzmann Law state about the total energy radiated?

• The total energy radiated decreases with increasing temperature.

• The total energy radiated is constant regardless of temperature.

• The total energy radiated is proportional to the square of the absolute temperature.

• The total energy radiated is proportional to the fourth power of the absolute temperature.

How is energy density related to temperature in black body radiation?

• Energy density is constant regardless of temperature in black body radiation.

• Energy density is proportional to the fourth power of temperature (u ∝ T^4) in black body radiation.

• Energy density is proportional to the square of temperature (u ∝ T^2) in black body radiation.

• Energy density is inversely proportional to temperature (u ∝ 1/T) in black body radiation.

What is the Rayleigh-Jeans Law and its limitations?

• The Rayleigh-Jeans Law accurately predicts all frequencies of black body radiation.

• It states that black body radiation increases indefinitely with temperature.

• The law is only applicable to gases and not to solids or liquids.

• The Rayleigh-Jeans Law describes black body radiation but fails at high frequencies, leading to the ultraviolet catastrophe.

How does the spectral distribution of a black body change with temperature?

• The spectral distribution remains constant regardless of temperature.

• The spectral distribution of a black body shifts to shorter wavelengths and increases in intensity with temperature.

• The spectral distribution shifts to longer wavelengths and decreases in intensity with temperature.

• The spectral distribution only changes in color but not in intensity with temperature.

What is the relationship between temperature and peak frequency according to Wien's Law?

• Temperature has no effect on peak frequency.

• Peak frequency is inversely proportional to temperature.

• According to Wien's Law, peak frequency is directly proportional to temperature.

• Peak frequency is constant regardless of temperature.

Describe how the Stefan-Boltzmann Law can be applied to real-world objects.

• The law can only be used for theoretical calculations and not for real-world applications.

• The Stefan-Boltzmann Law only applies to gases and not solids.

• The Stefan-Boltzmann Law can be applied to real-world objects by calculating the energy emitted by them based on their temperature.

• It states that energy is emitted based on the object's color, not temperature.