A-LevelPhysicsSuperposition9702/21 · Oct/Nov 2020 · Q65 Marks
A stationary wave on a string has nodes and antinodes. The distance between a node and an adjacent antinode is 6.0 cm.
- (a)Describe the conditions required for two waves to be able to form a stationary wave.[2]
- (b)(i)State what is meant by a node.[1]
- (b)(ii)Calculate the wavelength of the two waves forming the stationary wave.[1]
- (b)(iii)State the phase difference between the particles at two adjacent antinodes of the stationary wave.[1]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2020). The mark or mark type is shown in brackets.
- [B1] the waves (of the same type) move in opposite directions and overlap
- [B1] the waves have the same (speed and) frequency/wavelength
- [B1] zero amplitude
- [A1] distance = 6.0 × 4 = 24 cm
- [A1] 180°
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