An electron undergoes a transition from an initial (ni) to a final (nf ) energy state. the energies of the ni and nf energy states are −2.179×10−18j and −8.720×10−20 j, respectively.. calculate the wavelength (λ) of the light in nanometers (nm) corresponding to the energy change (δe) value of this transition. you can use the following values for your calculations: . planck′s constant (h) = 6.626×10−34 j⋅s. speed of light (c) = 2.998×108 m/s. 1 m = 109 nm

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Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".