Author Question: Approximately how many states in the range from 5.0 eV to 5.2 eV are there in a copper bar of volume ... (Read 39 times)

penguins · **on:** Jul 29, 2018

Approximately how many states in the range from 5.0 eV to 5.2 eV are there in a copper bar of volume 5.3 cm3?

(h = 6.626 10-34 J s, h = 1.055 10-34 J s, mel = 9.11 10-31 kg, 1 eV = 1.60 10-19 J)
A) 1.6 1022 B) 5.1 1022 C) 3.2 1022 D) 8.2 1021 E) 3.2 1021

Question 2

A straight wire that is 0.60 m and carrying a current of 2.0 A is placed at an angle with respect to the magnetic field of strength 0.30 T. If the wire experiences a force of magnitude 0.

18 N, what angle does the wire make with respect to the magnetic field?
A) 25 B) 35 C) 30 D) 60 E) 20