According to the Stefan-Boltzmann law, if an object\'s Kelvin temperature is dou
ID: 1405500 • Letter: A
Question
According to the Stefan-Boltzmann law, if an object's Kelvin temperature is doubled, the object emits
twice as much energy
four times as much energy
eight times as much energy
sixteen times as much energy
In appearance, an emission spectrum is
a continuous spectrum disrupted by dark lines
similar to a continuous spectrum
a number of distinct bright lines
[Any of the above, depending on the temperature of the emitting object]
The wavelength where the peak of the spectrum of a star is located tells us
the chemical composition of the star
the velocity of the star toward Earth
the velocity of the star away from Earth
the temperature of the star
The reason that many major telescopes are placed on high mountains is to
get them closer to the celestial objects they are observing
get them above as much atmosphere as possible
isolate astronomers from distractions while they work
[Both A and B]
A.twice as much energy
B.four times as much energy
C.eight times as much energy
D.sixteen times as much energy
Explanation / Answer
1)
according to stefans's law ,
the energy emitted per sec by object is proporational to T^4
hence , for Tnew = 2*T
energy radiated becomes 2^4 = 16 times
D) sixteen times as much energy
2)
in emmision spectrum , only those lines are present which are emitted by the atoms
hence , C. a number of distinct bright lines
3)
as peak wavelength is given as
wavelength = b/T
hence this tells us about D) temperature of the star
4)
B. get them above as much atmosphere as possible
To reduce the amount of atmosphere that we have to look through and also the atmosphere is more steady at altitude so we get better seeing. There are also less chance of being clouded out.
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