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Musya8 [376]
4 years ago
9

Light energy produces the only voltage in a solar cell. (a)-True(T) (b)- false(F)

Engineering
1 answer:
Burka [1]4 years ago
7 0

Answer:

True

Explanation:

The fundamental steps involved in the operation of a solar cell are as follows:

  • Light is incident on the solar cell and this light energy is absorbed by the solar cell.
  • The absorbed energy results in the movement of the electron inside the cell which constitutes the electric current in the cell.
  • Electric current flows and electricity is produced.
  • Hence,in solar cell the light energy is responsible for the only voltage in the cell.
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Oil with a kinematic viscosity of 4 10 6 m2 /s fl ows through a smooth pipe 12 cm in diameter at 2.3 m/s. What velocity should w
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Answer:

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Explanation:

Use following equation of Relation between the Reynolds numbers of both pipes

Re_{5} = Re_{12}

\sqrt{\frac{V_{5}XD_{5}  }{v_{5}}}= \sqrt{\frac{V_{12}XD_{12}  }{v_{12}}}

Re_{5} = Reynold number of water pipe

Re_{12} = Reynold number of oil pipe

V_{5} = Velocity of water 5 diameter pipe = ?

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v_{5} = Kinetic Viscosity of water = 1 x 10^{-6} m^{2}/s

v_{12} = Kinetic Viscosity of oil =  4 x 10^{-6} m^{2}/s

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Use the formula

\sqrt{\frac{V_{5}XD_{5}  }{v_{5}}}= \sqrt{\frac{V_{12}XD_{12}  }{v_{12}}}

By Removing square rots on both sides

{\frac{V_{5}XD_{5}  }{v_{5}}}= {\frac{V_{12}XD_{12}  }{v_{12}}}

{V_{5}= {\frac{V_{12}XD_{12}  }{v_{12}XD_{5}\\}}xv_{5}

{V_{5}= [ (0.23 x 0.12m ) / (4 x 10^{-6} m^{2}/s) x 0.05 ] 1 x 10^{-6} m^{2}/s

{V_{5} = 1.38 m/s

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3 years ago
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