CHEM Test 4

Question 1

nature of light

Answer 1

both particles and waves

Question 2

Isaac Newton

Answer 2

1665 - fundamental studies into the nature of light, proposed particulate nature

Question 3

Huygens/Hooke

Answer 3

wave nature of light

Question 4

Romer 1675, Fizeau 1849

Answer 4

measured speed of light 2.3 x 10⁸ m/s

then 3.1 x 10⁸ m/s

now 2.998 x 10⁸ m/s

Question 5

constructive interference

Answer 5

highs and lows line up – “high reinforces the high and doubles it”

Question 6

destructive interference

Answer 6

dark, empty spots

• highs and lows do not line up
• proves that light has waves
• In accordance with Huygens & Hooke

Question 7

Thomas Young (1801)

Answer 7

diffraction pattern of light showed its wave nature

Question 8

James Clerk Maxwell (1862)

Answer 8

mathematical theory of light as waves - predicted previously observed speed of light

light is produced by accelerated electric charge (out of mathematical equations)

Question 9

Heinrich Hertz (1888)

Answer 9

made and detected electromagnetic waves (also discovered the photoelectric effect)

“accelerate electric charge and gets electromagnetic waves”