An electron in the 2nd excited state is trapped in a 1-d infinite square well with edges at x-o and x 0.9 nm. a. sketch the wavefunction of the electron. b. calculate the energy of the electron. c. what is the probability of finding the electron between 0 and 0.3 nm? d. the energy of the sides of the well is lowered from infinity to about 10 ev. without calculating, describe how the energy and wavelength of the electron will change and explain why these changes will occur based on the wavefunction.

In what direction does the medium move relative to the direction of the wave? explain.

Mass (kg) force (n) 5 25 10 50 15 75 20 100 a student was trying to find the relationship between mass and force. he placed four different masses on a table and pulled them using a spring scale. the table shows the different masses used in the experiment and the force required to pull each mass. the student concluded that more force was required to pull heavier objects. what comment would you make regarding his conclusion? a) no clear relation can be observed between mass and force from the data. b) there is a direct proportion between the mass and force listed in the table. c) gravity should have been taken into account while performing the experiment. d) there is an inverse proportion between the mass and force listed in the table.

Afeather of mass 0.001 kg falls from a height of 2 m. under realistic conditions, it experiences air resistance. based on what you know about friction, what can you say about the kinetic energy of the feather as it reaches the ground? acceleration due to gravity is g = 9.8 m/s2. a. ke < 0.0196 j b. ke = 00196 j c. je = 0 j d. ke > 0.0196 j