astronomy chapter 3

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chapter 3

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

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