Answer:
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Hydrogen fuel cells is the answer
Explanation:
If the intensity of the yellow light increased, meaning more photons will strike the Potassium metal per unit area. This will cause more ejection of electrons from the metal and hence, the strength of current will also increase as we know that
I = Q/t, as the charge increase , the current will also increase.
If you were given distance & period of time, you would be able to calculate the speed.
Hope this helps!