Wavelength of light from a band gap (LED, photodiode), or the band gap from a wavelength

1. A.
   $654\text{ }nm$ and red colour
2. B.
   $1046\text{ }nm$ and blue colour
3. C.
   $1046\text{ }nm$ and red colour
4. D.
   $654\text{ }nm$ and orange colour

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1. A.
   15
2. B.
   11
3. C.
   13
4. D.
   21

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1. A.
   $407\text{ }nm$
2. B.
   $414\text{ }nm$
3. C.
   $207\text{ }nm$
4. D.
   $103.5\text{ }nm$

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1. A.
   $650\text{ }nm$
2. B.
   $1243\text{ }nm$
3. C.
   $875\text{ }nm$
4. D.
   $1400\text{ }nm$

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