A laser emits a beam of green visible light of wavelength 550 nm. When the beam strikes the surface of a metal, electrons are ejected from the surface. Which of the following statement(s) is/are INCORRECT? Check all that apply. Explain your reasoning for all choices. a) If the green laser emits twice the number of photons per second, the electrons will be ejected from the surface with twice the kinetic energy. b) If the green laser emits twice the number of photons per second, the number of electrons ejected per second from the surface will double. c) For the given green laser, replacing the metal surface with another metal of lower work function (binding energy) will increase the kinetic energy of the ejected electrons. d) For the given green laser, replacing the metal surface with another metal of lower work function (binding energy) will decrease the kinetic energy of the ejected electrons. e) For the given green laser, replacing the metal surface with another metal of lower work function (binding energy) will leave the kinetic energy of the ejected electrons unchanged but will increase the number of electrons ejected per second from the surface. f) If the green laser is replaced with a blue laser of wavelength 458 nm, electrons will not be ejected from the surface.
Particle Theory of Light
The particle theory of light was the proposal made by Newton in 1704 in his treatise Opticks. This is the most basic light theory, in which light is thought to be made up of microscopic particles known as "corpuscles" and that's why this particle theory of light is also named as Corpuscular theory of light.
Stopping Potential
In an experiment conducted by Heinrich Hertz, an apparatus was made where the incident light was made to fall on the metallic plate, it was discovered that metals emit electrons. The surface electrons are bound to metals with a minimum amount of energy and some of the incident photos enter the surface, they undergo collision with the atoms of the metal, they get absorbed and emit energy to an election, making it photoelectron, where the collision between the photons and electrons ejects the electrons out of the metal and with a negatively charged electron, causes photocurrent and when this current passes it creates an electric field where there is a potential difference at the output due to the anode and cathode of the electrode of the apparatus. This study involves the theory of Quantum physics and electromagnetism involving electromagnetic radiation and electromagnetic wave theory.
Quantization of Charges
An electron is a negatively charged subatomic particle either attached to an an atom or sticks to the nucleus of the atom. Electrons exert the negative charge that tries to balance the positive charge of the nucleus.
A laser emits a beam of green visible light of wavelength 550 nm. When the beam strikes the surface of a metal, electrons are ejected from the surface. Which of the following statement(s) is/are INCORRECT? Check all that apply. Explain your reasoning for all choices.
a) If the green laser emits twice the number of photons per second, the electrons will be ejected from the surface with twice the kinetic energy.
b) If the green laser emits twice the number of photons per second, the number of electrons ejected per second from the surface will double.
c) For the given green laser, replacing the metal surface with another metal of lower work function (binding energy) will increase the kinetic energy of the ejected electrons.
d) For the given green laser, replacing the metal surface with another metal of lower work function (binding energy) will decrease the kinetic energy of the ejected electrons.
e) For the given green laser, replacing the metal surface with another metal of lower work function (binding energy) will leave the kinetic energy of the ejected electrons unchanged but will increase the number of electrons ejected per second from the surface.
f) If the green laser is replaced with a blue laser of wavelength 458 nm, electrons will not be ejected from the surface.
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