How many visible-light photons are emitted per second
If the average frequency emitted by a 200,-,rm W light bulb is 5.00 times 10^{14} , {rm Hz}, and 10.0% of the input power is emitted as visible light, approximately how many visible-light photons are emitted per second?
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As a result of a temperature rise of 32°C, a bar with a crack at its center buckles upward (see figure below). If the fixed distance L0 is 3.77 m and the coefficient of linear expansion of the bar is 25x10-6/°C, find the rise x of the cent
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What are five to seven movements in the field of educational technology that you believe the K-12 large, urban school district should pay attention to.
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