Original questions for every module, with worked explanations and feedback on written answers.
Section I style
Multiple choice, worked or timed
Section II style
Short answers on a stimulus
Written answers
Read against the mark points, with your next step
Try 4 questions
Question 1
Orbital radius and period of three moons
Moon
Orbital radius (m)
Period (days)
A
2.25 × 10⁸
1.50
B
3.57 × 10⁸
3.00
C
5.66 × 10⁸
6.00
An astronomer measures the orbits of three moons of a distant planet. The orbits are close to circular, and the table gives them. What is the mass of the planet?
Question 2
Fine-beam tube results: accelerating voltage and the radius squared of the electron path
Accelerating voltage V (V)
r² (cm²)
150
17.1
200
22.7
250
28.4
300
34.1
In a fine-beam tube, electrons are accelerated from rest through a voltage V and then move in a circle of radius r at right angles to a uniform magnetic field of 1.00 × 10⁻³ T. A student's results are in the table. The points on her graph of r² against V lie on a straight line through the origin. What value of the charge-to-mass ratio of the electron, q ÷ m, does the gradient of this line give?
Question 3
Light passes through a gap in a barrier. When is the diffraction of the light most noticeable?
Question 4
Binding energy per nucleon: hydrogen-2 1.11 MeV, helium-4 7.07 MeV, iron-56 8.79 MeV, uranium-235 7.59 MeV.
Nuclide
Binding energy per nucleon (MeV)
hydrogen-2
1.11
helium-4
7.07
iron-56
8.79
uranium-235
7.59
The table gives the binding energy per nucleon of four nuclides. Which process would release energy?