Front

What is a black body in thermal equilibrium?

Back

A black body in thermal equilibrium emits as much radiation as it absorbs at every wavelength.

Front

What are the characteristics of a black body regarding reflectivity and transmissivity?

Back

A black body has no reflectivity (ρ=0) and no transmissivity (τ=0).

Front

What does Wien's law state about the peak wavelength of radiation emitted by a black body?

Back

Wien's law states that the peak wavelength (λmax) is inversely proportional to the temperature (T) of the black body.

Front

Calculate the peak wavelength of a black body at 3000 K using Wien's law (Wien's constant: 3 x 10^−3 mK).

Back

λmax = 3 x 10^−3 mK / 3000 K = 1 micrometer.

Front

What happens to the peak wavelength (λmax) if an object's temperature doubles?

Back

The peak wavelength (λmax) becomes half (1/2) of its original value.

Front

What does the emission spectrum of a black body depend on?

Back

The emission spectrum of a black body depends only on its temperature (K).

Front

Define a black body in terms of its absorption and emission properties.

Back

A black body is an ideal emitter and absorber of radiation.

Front

What is the significance of a black body in physics?

Back

A black body serves as a perfect model for understanding thermal radiation and the laws governing it.

Front

Explain the concept of thermal equilibrium in the context of a black body.

Back

Thermal equilibrium occurs when a black body absorbs and emits radiation at the same rate, maintaining a constant temperature.

Front

What is the relationship between temperature and peak wavelength according to Wien's law?

Back

As temperature increases, the peak wavelength decreases.