Consider a free particle with v(2) = 0, e > 0 with mass m in a periodic box with length l: (x, t) = 4(1) f(t) = aeikr + be-ikret (1) (a) find k in terms of e and l. (b) the wave function and its derivative must be continuous. since the point x = 0 is identified with x = l, write down the rsulting conditions and calculate the allowed energy levels.

Indoraptor for sure

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j

Ibelieve the answer is d. densityhope my answer has you : )

Planck decided to assume that atoms could only vibrate at certain frequencies that were whole numbers eg 2f, 3f and so on. others used to think that atoms vibrate continuously