Physics WPH13/01 May June 2021 | Edexcel International AS Level Past Papers With Mark Scheme

Edexcel International AS/A Level Physics (WPH) Jun 2021

معلم موافق رایگان بودن است.

1. density measurement of acetate sheets—instrument resolution table, use of balance, metre rule, Vernier calipers, method accuracy, uncertainty reduction with thickness
2. speed of sound using standing waves—tuning fork setup, air column resonance, average length calculation, uncertainty in measurement, speed formula \\(v = f\\lambda\\)
3. viscosity determination—micrometer diameter uncertainty, precaution for zero error, drag force from stationary and moving sphere readings, use of Stokes′ law
4. Planck constant from LEDs—activation voltage vs wavelength inverse graph, straight-line relation from \\(V = \\frac{hc}{e\\lambda} - W\\), data plotting, slope calculation, wavelength uncertainty impact on accuracy
5. percentage uncertainty evaluation—dominant error source in viscosity (force resolution, displacement, time), reliability of calculated η
6. consistency with accepted values—comparison between student and standard results, percentage uncertainty in agreement range, method limitations and data precision