1. How does an enclosure with a small hole in it behave as a black body? 2. Why is Planck’s law the basic law of thermal radiation? Explain graphically how  and T are related. 3. Show that...

1. How does an enclosure with a small hole in it behave as a black body?

2. Why is Planck’s law the basic law of thermal radiation? Explain graphically how
 and T are related.

3. Show that Rayleigh–Jeans law and Wien’s law can be derived from Planck’s equation.