Question

The number of incorrect statement/s about the black body from the following is _______
(A) Emit or absorb energy in the form of electromagnetic radiation 
(B) Frequency distribution of the emitted radiation depends on temperature
(C) At a given temperature, intensity vs frequency curve passes through a maximum value 
(D) The maximum of the intensity vs frequency curve is at a higher frequency at higher temperature compared to that at lower temperature

Hint:

The properties of black body radiation are governed by Planck’s law, Wien’s dis placement law, and Stefan-Boltzmann law. Remember, the peak frequency in creases with temperature, and the intensity curve always passes through a maximum.

Answer 1

Correct Answer: 0

The problem requires identifying the number of incorrect statements about a black body from given options. Let's evaluate each statement based on black body radiation principles:

• (A) Emit or absorb energy in the form of electromagnetic radiation: This is a correct statement. Black bodies emit and absorb all frequencies of electromagnetic radiation.
• (B) Frequency distribution of the emitted radiation depends on temperature: This is correct. According to Planck's law, the frequency distribution changes with temperature.
• (C) At a given temperature, intensity vs. frequency curve passes through a maximum value: This is also correct. The intensity peaks at a particular frequency determined by Wien's law.
• (D) The maximum of the intensity vs frequency curve is at a higher frequency at higher temperature compared to that at lower temperature: This is correct. Wien's displacement law states that as temperature increases, the peak frequency shifts to a higher value.

All statements (A) through (D) are correct. Thus, the number of incorrect statements is 0, which meets the expected range of 0 to 0.