Download Physics 30 Atomic Model Review

Physics 30 Worksheet Atomic Theory
1.
Use the following diagram to answer the next question:
700 N/C
0.150 T
2.1x10-3T
In the above mass spectrometer, an electron beam is used to positively ionize a sample.
a. What direction is the magnetic field acting to cause no deflection through the velocity selector? (1)
b.
What is the direction of the magnetic field in the separation chamber? (1)
c.
What is the velocity of the doubly charged ions that pass undeflected through the velocity selector? (2)
d.
What is the potential difference required to accelerate the doubly charged ions from rest in the
acceleration chamber? (2) (use unrounded answer from c)
e.
What is the mass of a doubly charged ion if the radius of curvature in the ion separation chamber is
46.4cm? (4) (use unrounded answer from c)
f.
If this ion has 20 neutrons, draw the symbol for this ion in the form (2)
Hint: find the number of nucleons….1 nucleon = 1.67x10-27 kg
g.
The following is an isotope of the atom in f. How many neutrons does it have (1)
42
20
Ca
2.
How was the nucleus discovered and by whom? (2)
a
b
X
3.
A Millikan wannabe set up an experiment using 2 parallel plates 6.0 cm apart with a potential difference of 1500
V. The mass of the hovering oil drop is calculated to be 1.63 x 10 -12g.
a. Calculate the electric field strength. (2)
b.
4.
5.
Find the number of elementary charges on the oil drop. (3)
A photon of visible light with wavelength of 435nm is emitted from a hydrogen atom when an electron moves
from a certain energy level to the second energy level.
a. What is the Energy of this photon? (2)
b.
What Energy level did it start off in? (2)
c.
An incoming electron with 12.5eV collides with an electron at ground state. Find the amount of energy
remaining to the incoming electron after the collision if, when the excited electron drops it produces a
maximum wavelength. (3)
d.
What is the wavelength of an electron in the second orbit? (1)
Describe how each type of spectrum is created(3)