Which example best illustrates that light behaves like particles?
light bends as it strikes a window.
light bounces off a white cement sidewalk.
light travels in space at a speed of about 3.0 x 108 m/s.
light increases in speed as it moves through matter.

Emergent properties of living systems are defined as properties that .

Atoms containing radioactive nuclei are called

Estimate the kinetic energy of the neptune with respect to the sun as the sum of the terms, that due to its daily rotation about its axis, and that due to its yearly revolution about the sun. [assume the neptune is a uniform sphere with mass = 1.0×1026 kg , radius = 2.5×1010 m , rotation period 16.1 h , orbital period 6.01×104 d and is 4.6×109 km from the sun.]