18) Why is the sky blue? Rayleigh scattering from gas molecules-shorter waveleng

Question

18) Why is the sky blue?

Rayleigh scattering from gas molecules-shorter wavelengths scatter more

Dust particles scatter red wavelengths

Blue, what blue?

Water molecules absorb red wavelengths leaving blue light behind.

.

19) Placing N-doped and P-doped semiconductors in series in a microcircuit creates what?

A superconductor

A flux capacitor

A resistor

A diode

.

20) Steel is generally made from what two elements?

Titanium and oxygen

Iron and silicon

Tungsten and fluorine

Carbon and iron

Please answer all of them without guessing!!! Thanks

Explanation / Answer

18) a) Rayleigh scattering from gas molecules-shorter wavelengths scatter more

19) d) A diode

20) d) Carbon and iron

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