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LED TV screen was developed by James P M...

LED TV screen was developed by James P Mitchell in . . . . .. . . . . .

A

1797

B

1977

C

2009

D

1987

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The correct Answer is:
B
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In Young's experiment, the upper slit is covered by a thin glass plate of refractive index 1.4 while the lower slit is covered another glass plate having the same thickness as the first one but having refractive index Interference pattern is observed using light of wavelength 5400A. It is observed that the point P on the screen where the central maximum (n=0) fell before the glass were inserted now has 3/4 th original intensity. It is further observed that what used to be the fifth maximum earlier, lies below the point P while the sixth minimum lies above P. Calculate the thickness of the glass plate.

FULL MARKS-ELECTRICITY-Additional Questions (I. Choose the correct answer)
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  2. When two 2Omega resistors are connected in parallel, the effective re...

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  3. When two 2Omega resistors are connected in series, the effective resis...

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  4. When n resistors of equal resistance (R ) are connected in series, the...

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  5. When three resistors are connected in parallel then the value of the e...

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  6. The effertive resistance for the given circuit in AB . . . . . . . . ...

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  7. The effective resistance between AB in the given circuit . . . . . . ...

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  8. Nichrome is . . . . . . . . . . ..

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  9. Tungsten material is used in . . . .. . . . . . .

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  10. The heat produced in an electric heater of resistance 2Omega is connec...

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  11. The SI unit of power is .

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  12. One horse power is

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  13. Kilowatt hour is the unit of

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  14. To protect the hourse hold electrical appliances from overloading due ...

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  15. In India, domestic circuits are supplied with frequency of . . . . . ...

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  16. Due to short circuit, efferctive resistance in the circuit becomes . ...

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  17. The colour of LED will depend on the type of . . . . . . . . . . . Us...

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  18. One way of overcoming the energy crisis is to use more . . . . . . . ...

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  19. LED TV screen was developed by James P Mitchell in . . . . .. . . . ....

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  20. The current in the electric bulb of 100 W and 200 V electric circuit i...

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