A light bulb operates at 21 percent efficiency the emitted
A light bulb operates at 2.1 percent efficiency. The emitted light is 555 nm, find the number of photons per second given off.
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a ball is thrown toward a cliff of height h with a speed of 30 ms at an angle of 60 degree above horizontal it lands on
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a light bulb operates at 21 percent efficiency the emitted light is 555 nm find the number of photons per second given
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