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Imagine that you have a 100 W incandescent light bulb (shame on you!), and it is shining uniformly into 4 steradians (outward equally in all directions). Please estimate for me (without a calculator). What is the power of visible light photons produced?
a) What is the efficiency of an incandescent light bulb?
b)
c) What is the rate of production of visible light photons?
d) Your eye receives ~1000 photons per second What intensity (of photons per second through the pupil) does this correspond to?
e) Over what area do the photons from your light have to be spread to provide you with the intensity you calculated above? from how far away in a perfectly dark night could you see a 100 W light bulb?
A suitcase full of platinum sits at the bottom of a lake. A recovery diver finds that as he lifts the suitcase to the surface, What is the volume of the large suitcase
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Every day our Earth receives 1.55×1022 J energy from the Sun. If we were able to use 1.05 percent of this energy to accelerate spaceships, how many missions would be possible in one year
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An asteroid is discovered heading straight toward Earth at 13km/s. An international team manages to attach a giant rocket engine to the asteroid. The rocket fires for 10 mins, after which the asteroid is moving at 28 degrees to its original path at a..
The figure below shows shows a 1.75-kg block at rest on a ramp of height h. When the block is released, it slides without friction to the bottom of the ramp, and then continues across a surface that is frictionless except for a rough patch of width 1..
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