# 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

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

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

can behave both as a wave and a particle

Kelvin

infrared

ultraviolet

x-ray

### x-ray telescopes are located in orbit around the earth because

x-rays dont reach the surface of earth

red light

violet

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

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

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

6000k

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

the utra violet

the infrared

the ultra violet

the X-Ray

81 =3^4

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

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

Example: