10 Questions
What is the formula for the energy of a photon?
E=hf
What is the work function of a metal in terms of Planck's constant and the threshold frequency?
ϕ=hfo
What is the maximum velocity of an emitted electron in terms of Planck's constant, the frequency of the incident EM wave, and the work function of the metal?
v_max=(2h(f-f_0))/m
What is the energy conversion of a charged particle in an electric field?
qV=1/2 mv^2
What is the formula for the energy of a charged particle in an electric field?
E=qV
What is the energy of an electron emitted from a metal surface, given that its maximum velocity is v_max and the work function of the metal is ϕ?
hf + 1/2 m v_max^2
What is the force exerted on an object moving in a circular path, given its mass, velocity, and radius of the circular path?
mv^2/r
A photon has an energy E. What is its frequency, given Planck's constant h?
E/h
A charged particle is accelerated through a potential difference V. What is its gain in kinetic energy, given its charge q and final velocity v?
qV
What is the energy of an electron in an electric field, given its charge q and the voltage V?
qV
Study Notes
Work Function and Photoelectric Effect
- The work function (ϕ) of a metal is the minimum energy required to eject an electron from the metal's surface, and it is related to the threshold frequency (f_0) by the equation ϕ = hf_0.
- The photoelectric law states that the energy of the incident photon (hf) is equal to the work function (ϕ) plus the maximum kinetic energy of the emitted electron (1/2 m〖v_max〗^2).
Energy of a Photon
- The energy of a photon (E) is directly proportional to its frequency (f) and is given by the equation E = hf.
Centripetal Force
- Centripetal force (F) is the force required to keep an object moving in a circular path, and it is given by the equation F = (mv^2)/r, where m is the mass of the object, v is its linear velocity, and r is the radius of the circle.
Energy Conversion of a Charged Particle
- The energy conversion of a charged particle in an electric field is given by the equation qV = 1/2 mv^2, where q is the charge of the particle, V is the voltage through which the particle is accelerated, m is the mass of the particle, and v is its velocity.
- The energy of a charged particle in an electric field is given by the equation E = qV, where E is the energy, q is the charge, and V is the voltage.
Test your understanding of the photoelectric effect, work function, energy of a photon, and energy conversion in various scenarios. Explore concepts like threshold frequency, maximum velocity of emitted electrons, and centripetal force in this quiz.
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