A building under construction requires building materials to be raised to theupper floors by cranes or elevators. An amount of c
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Answer:
E= 10.2 ev
Explanation:
It is given that energy in first exited state (n=2) , = -3.4 ev
Also , it is given than energy in ground state (n=1) , = -13.6 ev.
We know energy of photon released is difference of the final and initial level of electron.
Energy of photon released,
Therefore, .
To convert energy from ev(electron volt) into joule we need to multiply energy in ev by charge of electron which is ( )
Therefore,
Now , we know that photon is an quantum of light . Therefore, speed of photon in vaccum is equal to speed of light which is , .
Now, by energy-wavelength relation,
where ,
Now, putting values of h ,c and E in above equation .
We know,
Therefore,
Hence, this is the required solution.