A(n) absorbs energy and then emits electromagnetic radiation based on its . Classical physics predicted that at a high enough temperature, light would be emitted. Instead, white light was emitted, resulting in the ultraviolet . The photoelectric effect occurs when light shining on a metal creates a(n) . However, only light of a certain minimum causes electrons to flow. Gas atoms excited by an electric current emit bands of colors of light in a(n) . Each narrow band of light is associated with of a specific energy.

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day

-4 on

a skateboard rolling across the street - apex