Yes; heat and light travel together at the rate of 200,000 miles in a second of time.
Do all substances radiate heat equally well?
No; some substances are much better radiators than others.
What kind of objects are the best radiators?
Those with rough and dark surfaces.
What kind of objects are the poorest radiators?
Those with smooth and bright surfaces.
Why does water keep hot a long time in a bright tin vessel?
Because the tin is a poor radiator, and prevents the heat of the water from passing off into the air.
Why does water soon cool in a dull earthen vessel?