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The current of an ideal p-n junction under illumination can be described by:
J(V)=J0(eqVkT-1)-Jph
where J0 is the saturation-current density, Q the elementary charge, V the voltage, K the Boltzmann's constant,T the temperature and JPH the photo-current density.
A crystalline silicon cell generates a photo-current density of JPH= 35 MA/cm2 at T=300k. The saturation-current density is J0=1.95*10^-10 MA/cm2
Assuming that the cell behaves as an ideal p-n junction, calculate the open-circuit voltage Voc (in V).
To determine the specific heat of an object, a student heats it to 100 in boiling water. She then places the 68.5 object in a 196 aluminum calorimeter containing 135 of water. what is the specific heat of the object
A person of mass 75kg stands at the center of a rotating merry-go-round platform of radius 3.5mand moment of inertia 920kg?m2. compute the angular velocity when the person reaches the edge
an ion having charge 6e is traveling horizontally to the left at 8.55 kms. when it enters a magnetic field that is
The antenna for an AM radio station is a 75-m-high tower that is equivalent to one-quarter wavelength, At what frequency does the station transmit
a laser having an internal loss per round-trip of 0.015 when pumped at three times threshold has an output power of 4w.
a closed system undergoes a cycle consisting of two processes. during the first process 40 btu of heat is transferred
Through the compression stroke of a diesel engine, air is compressed from 1 atm and 27 degrees C to 1/25 of its initial volume. Suppose that Cv for air is 2R and that the compression is adiabatic. How much work is required per gram - mole?
A laser emits light at power 3.00 mWand wavelength 633 nm. The laser beam is focused (narrowed) untilits diameter matches the 1266 nm diameter of a sphere placed in itspath. What is the beam intensity at the sphere's location
White light strikes a diffraction grating ( 890 lines/mm) at normal incidence. What is the highest order visible maximum that is formed?
Water has a mass per mole of 18.0 g/mol, and each water molecule (H2O) has 10 electrons. What is the net charge of all these electrons
given three resistors r1 2 ohms r23 ohms and r3 4 ohms. how many combinations of equivalent resistance can you have.
You are an astronaut, and you observe a small planet to be spherical. What is the mass of the planet
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