An electron in a hydrogen atom drops from the n = 4 (-0.85 eV) to the n = 3 (-1.51 eV) state. What is the energy of the emitted radiation?
1. -2.36 eV
2. 0.66 eV
3. -0.66 eV
4. 2.36 eV

In the circuit, the switch s has been open for a long time and r = 125 kohm. it is then suddenly closed. (a) determine the time constant before the switch is closed. s (b) determine the time constant after the switch is closed. _ s (c) let the switch be closed at t = 0. find the current in the switch as a function of time. (use t for time. express your answer in milliamps and seconds.) i(t) =_

The friction of the water on a boat produces an acceleration of -10. m/s2. if the boat is traveling at 30. m/s and the motor is shut off, how long it take the boat to slow down to 5.0 m/s?

Match each type of lever with the correct diagram. 1. first-class 2. third-class 3. second-class