1. A 100-watt lightbulb radiates energy at a rate of 100 J/s (The watt, a unit...

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Chemistry

1. A 100-watt lightbulb radiates energy at a rate of 100 J/s(The watt, a unit of power, or energy over time, is defined as 1J/s). If all of the light emitted has a wavelength of 505nm, howmany photons are emitted per second? (Assume three significantfigures in this calculation.)

2.Calculate the de Broglie wavelength of a 143-g baseball travelingat 80 mph .
3.An electron undergoes a transition from an initial(ni) to a final (nf ) energy state. The energiesof the ni and nf energy states areâˆ’2.179Ã—10^âˆ’18 J and âˆ’8.720Ã—10âˆ’20 J, respectively.
Calculate the wavelength (Î») of the light in nanometers(nm) corresponding to the energy change (Î”E) value of thistransition. You can use the following values for yourcalculations:
Planckâ€²s constant (h)speed of light (c)1m===6.626Ã—10âˆ’34 Jâ‹…s2.998Ã—108 m/s109 nm

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Q 1 Power 100 w Js Wavelength of a photon 505 nm 505 E 9 m Calculation of energy of a photon E hcl sf Here E is energy in J h is planks constant 6626 E34 c speed of light See Answer

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