A 81.1 W monochromatic lamp that is 14.8% efficient produces photons with wavelength 957 nm. Find the number of photons emitted by this lamp each second.

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Q: Calculate the current in a 1500-W hairdryer when it is plugged in to 120 V.

A: Power in hairdryer:P=I2RP=VIso,v2R=VIwhere I=currentV=voltage=120 vP=power=1500 w

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