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In LED visible light is produced by...

In LED visible light is produced by

A

gallium phosphide

B

gallium arsenide

C

germanium phosphide

D

silicon phosphide

Text Solution

Verified by Experts

The correct Answer is:
b
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-PRACTICE SET 24-Paper 1 (Physics and Chemistry)
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  2. A bus moving on a level road with a velocity v can be stopped at a dis...

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  3. A block of mass 2 kg is at rest on a floor . The coefficient of static...

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  4. The resistance of a galvanometer is 50 ohm and the current required to...

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  5. A long magnet is cut in two parts in such a way that the ratio of thei...

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  6. Liquids and gases never exhibit

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  7. The initail and final position vectors for a particle are respectively...

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  8. For long distance transmission , the AC is stepped up because at high...

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  9. The inductive reactance of a coil of 0.2 H inductance at a frequecy o...

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  10. An alternating voltage V = V(0) sin omegat is applied across a circuit...

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  11. Find the component of vector A = 2hati + 3 hat j along the direction ...

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  12. The colour of bright fringe nearest central achromatic fringe in the i...

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  13. A parallel beam of monochromatic unpolarised light is incident on a tr...

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  14. A cathode ray tube has a potential difference of V between the cathode...

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  15. The work function of a metal surface is 4.2 eV. The maximum wavelength...

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  16. If the ionization energy for the hydrogen atom is 13.6 eV , the energy...

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  17. An optical fibre communication system works on a wavelength of 1.3xx10...

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  18. The output of OR gate is 1

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  19. In LED visible light is produced by

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  20. A transistor is a/an

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