Question

As the temperature of a body increases, the wavelength at which the maximum intensity occurs, increases

Answer 1

it is due to wens displacement laws which state that frequency of the peak of emission  increases lineraly with absolute temperature

Answer 2

According to the question,

As the temperature of a body increases, the wavelength at which the maximum intensity occurs, increases.

This statement is completely true.

This is a common physical phenomenon which is related to the physical characteristics of heat and their corresponding effects on the body where the heat is being applied.