A student compares two ideal blackbody intensity curves drawn on the same axes
PHYSICS · Single correct · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter
Problem
A student compares two ideal blackbody intensity curves drawn on the same axes. Curve P peaks at a shorter wavelength than curve Q, and at every wavelength the intensity of P exceeds that of Q. Which of the following conclusions is most consistent with these observations?
(a) The object producing curve P is cooler, but its much larger surface area causes it to emit more total power than the object producing curve Q.
(b) The object producing curve Q is hotter than the object producing curve P, because a longer peak wavelength indicates a higher temperature.
(c) The object producing curve P is hotter and emits more power per unit surface area than the object producing curve Q.
(d) The two objects have identical temperatures; the differences in intensity and peak wavelength are due to different emissivities or chemical compositions.