Physics · May / June 2017 · Paper 21 · Question 10
5054
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10(a)(i)[2]
10(a)(ii)[1]
10(b)(i)[2]
10(b)(ii)[3]
1 correct angle to surface ± 7° with correct orientation and similar wavelength (by eye) 2 at least two lines at smaller angle to surface with correct orientation in slower medium showing smaller and constant wavelength with wavefronts deviated in correct direction
10(c)(i)[2]
10(c)(ii)[2]
1 a range with 15–25 Hz as the lowest frequency and 15–30 kHz as the highest 2 1.6 cm (if highest frequency is 20 000 Hz)
10(c)(iii)[3]
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