A student recorded the favorite dipping sauces of the 70 people in his class. He wants to plot these data in a circle graph:

What angle should the wedge for ranch have?
A. 14°
B. 20°
C. 60°
D. 72

The radiation of the fire causes the saucepan to heat up. the conduction of the saucepan then to distribute the heat over the saucepan and to give heat to the water. the convection of the water distributing the heat within the water, till all the water is boiling

The fuzzy edges of shadows are a result of  diffraction 

Can give more details