Examiner reports

Question 1

Give one similarity and one difference between the image formed by the convex lens
and the image formed by the concave lens.

Answer 1

Similarity-(both are) diminished
Difference- concave is virtual and convex is
real.

Question 2

What piece of apparatus would have been suitable for measuring this wavelength?

Answer 2

metre rule.

Question 3

A student wants to investigate how the speed of a wave on a stretched string depends on the tension in the string.
Describe a method the student could use for this investigation.

Answer 3

add or take away masses from the string
adjust frequency using the signal generator
observe a stationary pattern
measure the wavelength
calculate wave speed from frequency and wavelength

Question 4

Explain why the egg is less likely to break when dropped onto soft foam rather than onto a concrete floor.

Answer 4

(soft foam) increases the time taken to stop
decreases the rate of change in momentum
reducing the force (on the egg)

Question 5

Explain the changing motion of the skydiver in terms of the forces acting on box the skydiver.

Answer 5

initially air resistance is less than weight
skydiver accelerates-causes the air resistance to increase
resultant force decreases to zero
-falls at terminal velocity

Question 6

Explain how a moving-coil microphone works.

Answer 6

sound (waves) cause the diaphragm to vibrate
the diaphragm causes the coil /wire to vibrate
the coil / wire cuts magnetic field lines
a potential difference is induced.