The apparent bending of a wave around the edge of an object is called . If a wave passes through a slit that has a width of the same order of magnitude as its , it will bend around both edges of the slit to give a semicircular wave.

Diffraction and Wavelengyh

20000 pounds

Explanation:

Generally 1 gallon of fuel burnt gives of 20 pounds of CO₂

Difference in the gallons of fuel burnt

The 20 mpg car burns 1000 gallons of fuel more than the 30 mpg car

The amount of CO₂ would be

The fewer pounds that the 30 mpg car would release is 20000 pounds