[OCR] 5
Topic: Atomic Structure
A transverse wave on a rope is travelling to the right. Fig. 5.1 shows the waveform at a particular time. Particles Q, R, S, T, U and V are labelled.\n
\nFig. 5.1
[10.0m]
Part 1: (a) On Fig. 5.1, indicate using arrows the directions in which the particles Q, S and U are moving. [3m]
Part 2: (b) State the motion of particles $R$ and $T$ at this instant shown.\n$\qquad$ [2m]
Part 3: (c) On Fig. 5.1, mark two particles on the waveform, other than Q, R, S, T and U, that are [1m]
Part 4: (i) in phase with each other (mark with ' $X$ '), [1m]
Part 5: (ii) in antiphase with each other (mark with ' + '). [1m]
Part 6: (d) Particle V leads particle $U$ by a phase of $\phi$.\n\nCalculate $\phi$. Explain your working.\n$$\phi=\ldots \quad \mathrm{rad}$$ [2m]
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