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Chapter 27 Physics Test

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1.
what are some speeds and times for light to travel different places?
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2.
what did newton think?
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3.
what did huygens think?
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4.
what are some early ideas of light?
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5.
what did michelson do?
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6.
what did galileo do?
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7.
what speed do electromagnetic waves travel at?
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8.
what are sources of light?
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9.
helpful hints-electromagnetic spectrum
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10.
how does this energy travel?
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11.
how does light affect things?
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what did roemer do?
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13.
what is the electromagnetic spectrum?
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14.
what do scientists now agree about light?
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15.
what did t young do?
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16.
what is transparent and opaque?
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17.
what did einstein do?
A.
left side longer wavelength-lower energy, right side-higher frequency, more energy
B.
light was waves and beams could pass through each other like waves do but people still believed newton
C.
they all travel at the same speed-the speed of light, but they are different in their frequencies and wavelengths
D.
some materials let light pass through-transparent (glass, air, water) most things don't let light pass at all-opaque (wood, metal)
E.
astronomer who studied moons of jupiter to learn about speed of light
F.
it has a dual nature, part particle and part wave
G.
sun, lamp, candle, glowing gases
H.
a wave that is partly magnetic and partly electric-electromagnetic wave, light is only one kind of electromagnetic wave, range-electromagnetic spectrum
I.
up until the 1600s thought light was particles that traveled in straight lines
J.
consists of radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, and gamma rays
K.
showed light could be spread out like waves (diffraction) and wave theory was accepted, 19th century
L.
around earth 7.5 times in one second, 8 minutes for light from the sun to reach earth, 4 years for light from the nearest star (AlphaCentauri), the distance light can travel in one year at 300,000km/s is called a lightyear
M.
light is the only thing you see, all visible objects either reflect or emit light, most of what we see is reflected light
N.
tried to measure speed of light with lanterns
O.
photo electric effect, consists of particles (mass less bundles of electromagnetic energy packaged in bundles called photons) move as waves
P.
light has been studied for thousands of years, greek philosophers thought it was particles that entered the eye and created vision others-streamers or filaments emitted from eye made contact with objects
Q.
discovered speed of light to be 300,000 km/s, using spinning mirror, 1st american-nobel prize
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18.
what is the speed of light?
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19.
what is the lowest frequency of light we can see? highest?
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20.
some things let light pass through in diffused directions (thin paper, frosted glass)
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21.
electromagnetic waves of frequencies lower than the red of visible light, heat lamps
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22.
energy that is given off by an accelerating electric charge (e-)
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23.
electromagnetic waves of frequencies higher than those of violet, sunburns

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