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.

Let us verify each statement about a black body:

(A) A black body emits and absorbs energy in the form of electromagnetic radiation. Correct.

(B) The frequency distribution of emitted radiation depends on temperature. Correct (Planck's law shows the spectral distribution changes with temperature).

(C) At a given temperature, the intensity vs frequency curve passes through a maximum value. Correct (Wien's displacement law).

(D) The maximum of the intensity vs frequency curve shifts to higher frequency at higher temperatures. Correct (Wien's displacement law: $$\nu_{max} \propto T$$).

All four statements are correct. The number of incorrect statements is 0.