Imagine that you take a beam of monochromatic light and start to reduce the power of this beam of light. As you get the power (intensity) lower and lower, what will happen to your observations of the beam of light with regards to observing individual photons?

No change in velocity of photons...

Explanation:

The reason speed of light is constant is that is doesn't depend upon intensity of light as produced by the source. This is the main reason why the wave function (psi)* in Einstein's Photoelectric experiment remains unaffected by intensity. The monochromatic beam of light will glow lower and lower as the power decreases and eventually vanishes from visible range as the emission from the power source has been stopped...

the answer is a 3.8cm

explanation:

it would be kevlar ^^