Answer:
The recoil speed is 
Solution:
Wavelength of a blue-green photon, 
Now, the energy associated with the blue-green photon:

where
h = Planck's constant
C = speed of light ion vacuum


Also, we know that the recoil speed can be calculated by the KInetic energy which is equal to the Energy of the blue-green photon:

where
= velocity of Hydrogen atom
= mass of H-atom
Now,



Answer:

Explanation:
Since the fly accumulated a positive charge of +73pC, it must have lost an equal number of negative charge of -73pC to the surface (because the housefly was neutral to begin with).
Therefore, to answer our question we have to ask ourselves <em>how many electrons combine to make -73pC of charge? </em>
The answer is since one electron carries a charge of
, the number
of electrons that make up -73pC
are


Thus, the housefly lost about 456 million electrons to the surface!
Answer:
The ball is going to be spinning in a clockwise direction.
Answer:
Wd-40 would make anything go faster
I believe the answer is C: For objects at extremely fast speeds.
Hope this helps!