A-LevelPhysicsPhysical quantities and unitsFeb/Mar 2020Paper 1 Q41 Mark
A transmitter emits a pulse of electromagnetic waves towards a reflector. The pulse is reflected and returns to the transmitter. A detector is located at the transmitter. The emitted pulse and the reflected pulse are displayed on a cathode-ray oscilloscope (CRO) as shown. [Figure showing a CRO display with two pulses marked with 1 cm separation for both amplitude and time] The pulse takes 6.3 µs to travel from the transmitter to the reflector. What is the time-base setting of the CRO?
A2.1 µs cm¯¹
B3.2 µs cm-1
C4.2 µs cm¯¹
D6.3 µs cm¯¹
✓ Correct Answer
The correct answer is C. This question tests the candidate's understanding of physical quantities and units within the Physicssyllabus. The examiner's mark scheme requires...
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🔒
Unlock the Examiner's Answer
Sign up for free to reveal the correct answer, the official mark scheme breakdown, and the examiner trap analysis for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep