10. Which of the following statements is false? As a rationale, write the correc

Question

10. Which of the following statements is false? As a rationale, write the correct statement A. We perform an experiment to determine the quanton's momentum, and find it has a value that corresponds to a de Broglie wavelength of 0.45 nm to a high precision. Then the position of the quanton is not well defined. B. In a semiconductor, the thermal energy (jostling of electrons) helps electrons in the filled valence band to jump to the conduction band where they can move freely. Hence, the semiconductor will become less conductive with increasing temperature. C. In quantum mechanics, if the electron's wavefunction is an energy eigenfunction, it doesn't change with time. This explains the stablity of atoms. D. If we send an electron with an unknown initial spin state through an SGz device and it emergies from the-channel, the electron's emergying spin state is l-

Explanation / Answer

A) is true because the uncertainty in measuring position and momentum are related by the uncertainty principle of Heisenberg.

B) is false. The electrical conductivity of a semiconductor increases with increase in temperature because with an increase in temperature the electrons overcome the energy barrier between the valence band and the conduction band easily.

C) is partially correct. The wavefunction changes but the probability density remains constant with time. This explains the stability of atoms

D) is true.

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.