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A 100W ultraviolet light source of wavelength 200nm illuminates a magnesium surface 5m away. (a) The photoelectric work function for a material is 3.25eV. Calculate the kinetic energy of the fastest electrons ejected from the surface. (b) Determine the maximum wavelength for which the photoelectric effect can be observed.
The potential of a typical storm cloud can be as high as 109 volts. When lightning is produced, a typical lightning strike can produces an electric current of 20,000 amps.
Explain why the VOLTS/DIV knob of an oscilloscope doesn't have to be calibrated and the TIME/DIV button must be calibrated when measuring time-constants
A conveyor belt is used to move sand from one place to another in a factory. The conveyor is tilted at an angle of 13.3° from the horizontal and the sand is moved without slipping at the rate of 6.51 m/s. The sand is collected in a big drum 2.89 m be..
A 34.7 m long aluminum wire at a temperature of 24.3 oC has a radius of 0.295 mm. what is the resulting current in the wire
You are piloting a spacecraft whose total mass is 1170 kg and attempting to dock with a space station in deep space. How long should you sustain the firing of the retro-rocket
a doubly ionized carbon atom with charge 2e is located at the origin of the x axis and an electron with charge -e is
a -3.4 nc charge is on the x-axis at x1 -7 cm and a 4.2 nc charge is on the x-axis at x2 13cm.at what point or points
Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. What is the orbital period of the faster planet
Three insulating balls are suspended from thin threads. Various objects are then rubbed against other objects and each of the insulating balls is charged by touching them with one of these objects. In each case.
The engineer takes 0.400 seconds to react, and then applies the brakes. At what rate must the passenger train then decelerate in order to avoid a collision?
The second-order fringe of 610 nm light is observed at an angle of 12° when the light falls on two narrow slits. at what angle would we expect it to be observed
Illustration on Eratosthenes' process
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