Schrödinger and Heisenberg

Science

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6 questions

Isabelle

•almost 3 years ago

Question 1

Multiple Choice

10 points

Three correct statements about the behaviour of electrons are:

I. An electron beam is used to investigate the structure of crystals.

II. An electron beam produces a pattern of fringes when sent through two narrow parallel slits.

III. Electromagnetic radiation ejects electrons from the surface of a metal.

Which statements are explained using the wave-like properties of electrons?

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

Question 2

Multiple Choice

10 points

Which graph shows a possible probability density function $\left|\Psi\right|^{2\ }=\frac{P\left(r\right)}{\Delta V}$ for a given wave function $\Psi$ of an electron?

Click here for the image: https://drive.google.com/file/d/1uWMiz3PMBrFmiqEkDiRdcCPPRPdoyvp6/view?usp=sharing

Question 3

Multiple Choice

10 points

What is a consequence of the uncertainty principle?

A. The absorption spectrum of hydrogen atoms is discrete.

B. Electrons in low energy states have short lifetimes.

C. Electrons cannot exist within nuclei.

D. Photons do not have momentum.

Question 4

Multiple Choice

10 points

What is true for the Bohr model for the hydrogen atom?

A. Angular momentum of electrons is quantized.

B. Electrons are described by wave functions.

C. Electrons never exist in fixed orbitals.

D. Electrons will continuously emit radiation.

Question 5

Multiple Choice

10 points

A particle is confined within a nucleus. What is the order of magnitude of the uncertainty in the momentum of the particle?

A. $10^{-10}\ Ns$

B. $10^{-15}\ Ns$

C. $10^{-20\ }Ns$

D. $10^{-20\ Ns}$

Question 6

Multiple Choice

10 points

A proton has momentum $10^{-20}\ Ns$ and the uncertainty in the position of the proton is $10^{-10}\ m$ . What is the minimum fractional uncertainty in the momentum of this proton?