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A 0.100-mA electron beam with kinetic energy of 54.0 eV enters asharply defined region of lower potential where thekinetic energy of the electrons is increased by 10.0 eV. What current is reflected at the boundary?
An ideal massless spring is hanging vertically. When an unknown mass is attached to the spring, the spring stretches by 4.8 cm before reaching a new equilibrium. What is the frequency of the resulting oscillation
In the Bohr model of the hydrogen atom, an electron in the 3rd excited state moves at a speed of 2.43 105 m/s, What is the effective current associated with this orbiting electron
The work function for potassium is 2.24 eV. If potassium metal is illuminated with light of wavelength 300 nm
The number of electrons in a copper penny is approximately 10*10^23, How large would the force be on an object if it carried this charge and were repelled by an equal charge one meter away?
Blue light (wavelength=460nm) is incident on a piece of potassium= 2.2eV. What is the maximum kinetic energy of the ejected photoelectrons
The work required to stretch a certain spring from anelongation of 4cm to 5cm is 30.5J. What is the work required to increase the elongation from 5cm to 6cm
two speakers that are in phase with each other are separated by a distance of 4.3 m and met a sound of frequency 221hz.
a long pipe of outer radius 4.00 cm and inner radius 3.40 cm carries a uniform charge density of 3.22 mcm3. using
if a blue filter is placed over a light source aperture so that the incident rays are blue and these rays pass through
Suzy is holding her kite on a string 25.0 m long when the kite hits the top of a flagpole, which is 14.9 m higher than her hands. Assuming that the string is taut and forms a straight line
a particle of mass m is in the ground state of a harmonic oscillator with parabolic potential energyvx frac12
A loop of wire in the shape of a rectangle of width 8 cm and length 90 cm and a long, straight wire carrying acurrent I= 5t^1.4-3t^1.8 downward lie on a tabletop; What is the direction of the induced current
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