PLEASE HELP An electron moves from n=2 to n=3. Use the Balmer series to find the following; i)wavelength for n=2 ii)Energy for n=2 iii) Wavelength for n=3 iv) Energy for n=3 v) Energy absorbed when moving from n=2 to n=3. (h=6.63*10^-34Js; c=3*10^8m/s) (Hint: ∆E=Ef - Ei where f=final and i=initial)

What is a good example of instantaneous speed

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.

Awind turbine is rotating counterclockwise at 0.5 rev/s and slows to a stop in 10 s. its blades are 20 m in length. (a) what is the angular acceleration of the turbine? (b) what is the centripetal acceleration of the tip of the blades at t=0s? (c) what is the magnitude and direction of the total linear acceleration of the tip of the blades at t=0s?