πŸ“ OCR A Physics Paper 3 prep guide β€” last-minute revision, hints & synoptic topics

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AS Β· Quantum physics (Module 4.2): photoelectric effect

In a school lab, a clean metal surface in a vacuum tube is illuminated with monochromatic UV light of wavelength 365 nm. The stopping potential needed to reduce the photocurrent to zero is measured as 0.80 V. Using hc β‰ˆ 1240 eVΒ·nm, which is the best estimate for the metal’s work function?

A2 Β· Quantum (M4)

In a vacuum photoelectric experiment, a clean metal surface is illuminated by monochromatic light of fixed frequency well above the threshold. The anode is held sufficiently positive to collect all emitted electrons. If the light intensity is doubled while the frequency is unchanged, which statement must be true?

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