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(a) A hydrogen atom has its electron in the n = 4 level. The radius of the electron's orbit in the Bohr model is 0.847 nm. Find the de Broglie wavelength of the electron under these circumstances.
A 1.18 m long sample from a roll of string is measured to have a mass of 1.04 g. find the wavelength of traveling waves on this string which have frequencies of 40.0 Hz and 5.00 Hz
Two ants race across a table 66 cm long. One travels at4.42 cm/s and the other at 3cm/s. When the first one crosses thefinish line, how far behind is the second one
An object is thrown downwardwith an initial speed of 15 m/s from a height of 83 mabove the ground. At what height above the ground will the two objects pass each other
A copper bowl of mass m1 contains a mass m2 of water, both at temperature T (which is below the boiling point of water). How much energy is transferred to the water as heat
in order to move a 500 kg pallet load of bricks down a smooth concrete driveway you tie a rope between the pallet and
A sports utility vehicle has tires which are 110 cm in diameter. If the wheel is rotated through 30 revolutions, how far forward does a point on the tire travel
Explain how the process of "doping" a semi conductor can improve its overall efficiency. Why does "doping" require a clean room infrastructure
What is the significance of the mechanical advantage of class 3 levers? What class lever is represented by a fishing pole? Why? What kind of lever is represented by an oar used in rowing? Why
A ball is thrown straight upward and reaches the top of its path in 1.71 s (before it starts to come back down). At what speed must the second ball be thrown
Two forces, and , act on the 7.00-kg block shown in the drawing. The magnitudes of the forces are F1=55.5 N and F2=33.5 N. Find the horizontal acceleration of the block
What centripetal force will the ride exert. How far should the stone fall so that the pulley has 6.50 J of kinetic energy.
The frequency of a tuning fork is 358 Hz. Find the length of the shortest organ pipe which will give 6 beats/s with the fork. The velocity of sound in air is 339.1 m/s.
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