Original questions for all six topics, with worked explanations and feedback on written answers.
Multiple choice
Worked, or in timed checks
Clusters
A phenomenon, data and several one-credit parts
Written answers
Read against the creditable answers, with your next step
Try 4 questions
Question 1
Four nuclear decays
Decay
Protons before
Mass number before
Protons after
Mass number after
Radium-226 to radon-222
88
226
86
222
Nitrogen-13 to carbon-13
7
13
6
13
Strontium-90 to yttrium-90
38
90
39
90
Excited cobalt-60 to cobalt-60
27
60
27
60
The table lists four nuclear decays with the number of protons and the mass number of each nucleus before and after. In which decay does the number of neutrons in the nucleus increase?
Question 2
Paper clips lifted
Number of turns
Clips at 0.50 A
Clips at 1.00 A
10
3
6
20
6
12
30
9
18
Students record how many identical paper clips an electromagnet lifts for different numbers of turns and currents (table, an invented data set). If the pattern in the table continues, how many clips would 40 turns lift at a current of 0.75 A?
Question 3
Object and image distances for one biconvex lens
Object distance (cm)
Image distance (cm)
15
30
20
20
30
15
60
12
A student places a candle at different distances from a biconvex lens and moves a screen until the image is sharp (table). What is the focal length of the lens?
Question 4
Galaxies in the model
Galaxy
Distance (million light-years)
Speed away (km/s)
P
150
3300
Q
300
6600
R
450
9900
S
600
13200
A computer model of an expanding universe gives the distance of four galaxies from the Milky Way and the speed at which each moves away (table). Which conclusion does the model's data support?