Final answer:
Black objects are good absorbers and good radiators, while white objects are poor absorbers and poor radiators. This is why a body with large reflectivity is a poor emitter.
Step-by-step explanation:
All objects absorb and emit electromagnetic radiation. The rate of heat transfer by radiation is largely determined by the color of the object. Black is the most effective, and white is the least effective.
Black objects are good absorbers and good radiators, while white objects are poor absorbers and poor radiators. This is why a body with large reflectivity, such as a white or silver object, is a poor emitter.