Explore BrainMass

# Physics Homework Help

Not what you're looking for? Search our solutions OR ask your own Custom question.

This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

1. An electron with amass of 9.11*10 -31 kg has a velocity of 4.3*10 6m/s in the innermost orbit of a hydrongen atom. What is the de Broglie wavelength of the electron?

7. An electron wave making a standing wave in a hydrogen atom has a wavelength of 8.33*10 -11m. If the mass of the electron is 9.11*10 -31kg, What is the velocity of the velocity of the electron according to the de Broglie equation?

8. Using any reference you wish, write the complete electron configurations for (a) nitrogen, (b) phosphorus, and (c) chlirine.

12. Identify the number of protons, neutrons, and electrons in the following isotopes:
(a) 14/4 N
(b) 7/3 Li
(c) 35/17 C
(d) 48/20 Ca
(e) 63/29 Cu
(f) 230/92 U

13. identify the period and the family in the periodic table foe the following elements:

(a) Xeron
(b) Potassium
(c) Chromium
(d) Argon
(e) Bromine
(f) Barium

17. Use the periodic table to identify if the following are metals, nonmetels, or semiconductors:

(a) Kyrpton
(b) Cesium
(c) Silicon
(d) Sulfur
(e) Molybdenum
(f) Plutonium

Please show work inside solution window and send attachment. I have problems downloading some attachment so thats why i asked for both methods!!! Thank in advance

Â© BrainMass Inc. brainmass.com March 4, 2021, 9:54 pm ad1c9bdddf
https://brainmass.com/physics/quantum-physics/phy-science-bill-tillery-edition-281492

#### Solution Preview

1. The de Broglie wavelength is equal to:
lambda = (h/(m*v))*sqrt(1 - v^2/c^2)

Substituting the values, we have:
lambda = (6.626x10^-34)/(9.11x10^-31 * 4.3x10^6) * sqrt(1 - (4.3x10^6)^2 / (3x10^8)^2)
lambda = 1.69x10^-10 m

7. Using de Broglie equation, we can solve for velocity:
lambda = (h/(m*v))*sqrt(1 - v^2/c^2)
8.33x10^-11 ...

#### Solution Summary

This posting contains the solution to the given problems.

\$2.49