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Question: a) An electron occupies the highest energy level of the valence band in a diamond crystal. What is the maximum photon wavelength that will excite the electron into the conduction band? In diamond, the energy gap between the valence and conduction bands is 7eV.
b) Mr Smith refuses to believe that a potential difference can be created simply by bring two different metals into contact with each. How will you convince Mr Smith that it is possible to create potential difference in this manner.
c) You can not see anything smaller than a wavelength of the wave used to make the observation. What is the minimum energy of an electron needed in an electron microscope to see an atom that has a diameter of about 0.1 nm ?
d) What is a wave packet ?
e) Write a note on the origin of energy bands in solids.
A rectangular billboard in space has the dimensions 10 meters by 20 meters. How fast and in what direction with respect to the billboard would a space traveler have to pass for the billboard to appear square?
Mattwe pulls his little sister sarah in a sled on an icy surface, with a force of 60 N at an angle of 37 ° upward from the horizontal. If he pulls her a distance of 12m, then determine the work done by matthew?
In a live fire exercise, an Army artillery team fires an artillery shell from a howitzer. Find the x and y coordinates of the target
Potential energy of a not obeing Hooke's law spring is given by the equation U(x)=5.00(J/m)x - 2.00(J/m3)x3, What is the expression for the restoring force of the spring
A baseball pitcher throws a 145 g baseball parallel to the ground with a speed of 39.03 m/s in the +x direction. What is the velocity of the ball after leaving the bat
A 767 kg satellite is in a circular orbit about the Earth at a height above the Earth equal to the Earth's mean radius. Find the period of its revolution
LASIK eye surgery uses pulses of laser light to shave off tissue from the cornea, reshaping it. What is the power of one laser pulse
Kenny is dropped into a volcano. Stan and Kyle try to use a lift to save Kenny from rising lava. The efficiency of the motor is 0.4 and Kenny has a weight of 40kg. In order to save him, they must lift him 50 meters in 15 seconds. What is the faste..
Conceptual objective: To study some basic quantities in alternating current (AC) circuits. Calculate the resonant frequency in a series RLC circuit
A proton travels with the speed of 8.34×105 m/s at an angle of 32.3° with the direction of a magnetic field. The field exerts a force of 3.00×10-17 N on the proton. What is the strength of the field.
find the coefficient of kinetic friction between skis and snow.Three equal point charges, each with charge 1.80 mu C, are placed at the vertices of an equilateral triangle whose sides are of length 0.500 m. What is the electric potential energy U o..
An X-ray photon with a wavelength of 0.260nmscatters from a free electron at rest. Find the final momentum of the photon
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