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An LED is constructed from a pn-junction based on a certain GA-As-P semiconducting material whose energy gap is 1.9 eV. What is the wavelength of the emitted light?
A ball is thrown horizontally from the top of a building 19.0 m hight and lands 64.7 m from of the building, With what initial speed was the ball thrown
The positron is a particle with the same mass as an electron but charge +e. what's the radius of its trajectory in the bubble chamber
Consider Iron asteroid (density 7900 kg/m^3) shaped like a cylinder 5.0 km long and 3.0 km in diameter, How much fuel is required to spin up the asteroid
find out the average force exerted on the bullet by the expanding gases as the bullet moves through the length of the 50 cm barrel.
Consider a regular hexagon of side length, L = 10cm. A charge, Q = 2µC, is located at each vertex, Find the electric field vector at the center
What is force necessary on one end of apparatus in order to lift the car? How much work is done lifting the car?
One long wire lies along an x axis and carries a current of 42 A in the positive x direction, What is the magnitude of the resulting magnetic field at the point (0, 2.0 m, 0)
An x-ray photon with wavelength 5.0 pm collides with a free electron initially at rest. find the maximum possible kinetic energy acquired by the electron
A double-slit apparatus consists of two of slits separated by 0.25 mm with a screen 5.0 cm away. Calculate the wavelength of the light
An alpha particle (the nucleus of a helium atom formed by 2 protons and 2 neutrons with charge q = +2(1.6 x 10-19 C ) is moving perpendicular to a magnetic field of 0.530 tesla at a velocity of 3.00E+6 m/s, Calculate the acceleration of the alpha p..
Evangelista Torricelli was the first to put forward the idea that we live at the bottom of an ocean of air. (i) Given the value of the atmospheric pressure at the surface of the Earth.
Lightning can be studied with a Van de Graaff generator, which consists of a spherical dome on which charge is continuously deposited by a moving belt, What is the maximum charge on the dome
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