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

Question

18) Why is the sky blue?

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

b) Dust particles scatter red wavelengths

c) Blue, what blue?

d) 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) A superconductor

b) A flux capacitor

c) A resistor

d) A diode

.

20) Steel is generally made from what two elements?

a) Titanium and oxygen

b) Iron and silicon

c) Tungsten and fluorine

d) 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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