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He said to find out internal energy ^U ?

so i got ans is;

formula ; W=P*(V2-V1)

OPTIONS;A;-500j

                B;  -505j

                 C; +505j

                   D;1136.25j

MY ANS ; -500J

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A Abhishek Sahu
Answered Mar 03, 2019

It is given that the process is adiabatic

Hence, \Delta U +W =0

\Rightarrow \Delta U = -W

W = P\Delta V

W = 2.5\times 1.01\times 10^{5}\left ( 4.5 -2.5 \right )10^{-3}

W = 505\: J

\Delta U = -505 J

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A Ankit Dutt
Answered Apr 04, 2019

According to Bohr's model -

1. Force of attraction between the nucleus and an electron is equal to centripetal force.

2. mvr=\frac{nh}{2\pi }

    n = principal quantum number.

3. Energy can be absorbed or emitted when electron transfers between the orbits  E_{1}-E{_{2}}=h\nu
 The orbital angular momentum is given by \sqrt{l(l+1)}\frac{h}{2\pi } where l is the azimuthal quantum number for p orbital, l=1

\therefore orbital angular momentum = \sqrt{(1)(1+1)} \frac{h}{2\pi }

                                  = \sqrt{2} \frac{h}{2\pi } = \frac{h}{\sqrt{2}\pi }

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A Ankit Dutt
Answered Apr 04, 2019

Moles of urea = Number of molecules/Avogadro number
=> 6.02x10^20/6.02x10^23
=> 10^-3 moles

Now, concentration or molarity = Number of moles/ volume in litre
=> M = (10^-3/100)*1000
=> M = 10^-2 M

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