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47 terms

astronomy chapter 3

chapter 3
STUDY
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a waves velocity is the product of the
frequency times the wavelenght v=f (lambda)
the humber of waves passing the observer per second is
the frequency in hertz
wavelentgh of a curve can be measured from.... to...
from... peak to peak
both sound waves and electromagnetic radiation
transfer energy
what does the phenomenon of difraction demonstrate
the wwave natur eof light
what does the phenomenon of interference demonstrate
the wave nature of light
which of these is constat for all types of elctromagnetic radiation in a vacuum
velocity
which statement gives the relashionship between the waves in the electric and magnetic fields in an electromagnetic wave
they are in phase but perpendicular to each other in space
electromagnetic raditon....
can behave both as a wave and a particle
the temperature scale that places zero at the point where all atomic and molecular motion ceases is
Kelvin
which form of electromagnetic radiation is absorbed by carbon dioxide and water vapor
infrared
what form of electromagnetic radiation would be blocked in the startosphere by ozone
ultraviolet
of all the forms of electromagnetic radiation, the one with the lowest frequency is
radio waves
the earth ionosphere partially blocks which form of electromagnetic radiation
radio
the two forms of electromagentic radiation that penetrate the atmosphere best are
visible and radio waves
the hottest objects with temperatures in the millions of degrees kelvin give off most of their radiation in which part of the electromagnetic spectrum
x-ray
x-ray telescopes are located in orbit around the earth because
x-rays dont reach the surface of earth
electromagnetic radiation with a wavelength of 700nm would be
red light
the visible color of electromagnetic radiation tha has the shortest wavelentgh is
violet
colors appear different to us because of their photons' different
frequencies
there are no x-ray telescopes on earth because
x-rays dont penetrate earths atmosphere
there ar eno radio telescopes in space because
radio waves penetrate earth atmosphere so there is no need to put one in space
the radiation our eyes are most sensitive to lies in the color
yellow-green at about 550nm
which type of radiation can be onserved well from earths sruface
visible
what is true of a blackbody
its energy peaks at the wavelentgh determined by its temperature
according to wiens law, if the surface temperature is increased by a factor of 2, its peak wavelength...
decrease by a factor of 2
star A has a temperature 1/2 that of star B, but star A is 5 times bigger than star B, which implies
star A is redder and brighter than star B
star A and B HAVE THE SAME TEMPERATURE, BUT DIFFERENT LUMINOSITIES, WE CAN INFER THAT...
nothing
star A has a temperature 1/2 that of star B but star A is 3 times bigger than star B. Which implies....
star A is redder and dimmer than star B
the total energy radiated by a blackbody depends on
the fourth power of its temperature t^4
star A and star B have the same temperature, but star B is more luminous than star A, IMPLIES THAT
star B must be bigger
at which of these kelvin temperature would a blackbody radiate mostly at visible wavelentghs
6000k
the wavelentgh at which a blackbody radiates most depends on its
temperature
star A has temperature 3 times that of star B, both star A and B are the same size, it can be infered that...
star A and B have the same color but star A is brighter
star A has a temperature 1/4 that of star B. Both star A and star B are the same physical size...implies
star A is redder and dimmer than star B
very low temperature molecular clouds emit most of their light in which part of the electromagnetic spectrum
the radio
very hot young stars, like those in Messier 2 emit most of their light in which part of the electromagnetic spectrum
the utra violet
a dim young star like herbig-haro 68 emits most of its light in which part of theelectromagentic spectrum
the infrared
stars like our sun emit most of their light in which part of the elctromagnetic spectrum
the ultra violet
to see the sun's hot corona(1million kelvin) which part of the electromagnetic spectrum should one observe
the X-Ray
increasing the temperature of a blackbody by a factor of 3 will increase its energy by a factor of
81 =3^4
increasing the temperature of a blackbody by a factor of 2 will increase its energy by a factor of
16 =2^4
as the sun evolves into a red giant in the distant future, then according to wiens law
its peak on planck curve will move into the infrared
stefan's law says...
that if the suns temperature were doubled, it would give off 16x more energy
the doppler effect is a phenomenon that alows one to measure an objects
radial motion
the light from an object moving (right to left) tangentially will exhibit...
no shift
if a light source is approaching you at a speed very close to the speed of light it will appear ..
bluer and brighter than it is