Question

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Exam 2 EO Systems Name Do no ask any questions about the exam. Make changes to the questions if you feel there is an error and state your reason for making the change. Raise your hand for another sheet of paper or to excuse yourself to the restroom. All exams will be scanned before and after grading- Look at the value of the questions. Work quickly and glive brief explanations and answers (25%) Particles: A) If electrons carry or (transport) charge, then phonons carry (or transport) B) If a potential gradient exerts a force on an electron, then a gradient can exert a force on an electron or phonon. If the energy of a photon depends on wavelength, C) then the energy of an electron depends athematically describe the electrical, mechanical, and chemical gradients and related fields which can act on the electron, phonon, and photon.

Answer 1

1.if the electron carry or (transport) charge,then the photons carry(or) transport
ANS) Photons do not transport or transfer charge; only energy, momentum and angular momentum.

2.If the potential gradient exerts a force on a electron then a spatial gradient gradient can exert a force on a electron or phonon

3.The ENERGY of the photon depends on its wavelength. Sunscreen is used to absorb the high energy UV photons that can cause skin cancer, while letting the photons of visible light come through.
According to quantum mechanics, energy level of electrons in an atom only depend on principal quantum number, . ... The first term in this expression is the kinetic energy of each electron, the second is the potential energy of each electron due to the nucleus, and the third is the electron-electron interaction.