If a wave hits a smooth surface at an angle of incidence of 40 degrees, the angle of reflection is
a. 0 degrees.
b. 40 degrees.
c. 80 degrees.
d. 90 degrees.

When the velocity of an object is doubled, by what factor is its momentum changed? by what factor is its kinetic energy changed? a) the momentum is zero. b) the momentum is not zero. c) difficult to say.

What type of nuclear decay causes the atomic number of an element to increase by 1?

Lin yao looks at the back of a spoon. how should she describe her reflection? upside down and smaller upside down and larger right-side up and smaller right-side up and larger