(a) correct reflections at both surfaces; 1. correct refraction at top surface; 2 (b) for one angle of viewing, one colour interferes destructively/ another interferes constructively; white light minus that colour is seen / colour seen is determined by colour that interferes constructively; at different viewing angle, different colour interferes destructively/ constructively; 2 max [4] 2. = ; λ = ; = 0, = 1383 nm, = 1, = 461 nm, = 2, = 276 nm; m m m λ λ λ therefore blue as = 1 gives the only value in the visible range; 4 m = Award [3 max] if is omitted and answer is red 692 nm. λ [4] 3. (a) (i) zero; 1 (ii) ; 1 or π (iii) zero; 1 (b) 2nt = ; = 110 nm; 2 t [5] 4. C [1] 5. A [1] 6. C [1] D 7. [1]
1. (a) correct reflections at both surfaces; correct refraction at top surface; 2 (b) for one angle of viewing, one colour interferes destructively/ another interferes constructively; white light minus that colour is seen / colour seen is determined by colour that interferes constructively; at different viewing angle, different colour interferes destructively/ constructively; 2 max [4] 2. λ = ; = ; m = 0, λ = 1383 nm, m = 1, λ = 461 nm, m = 2, λ = 276 nm; therefore blue as m = 1 gives the only value in the visible range; 4 Award [3 max] if is omitted and answer is red λ = 692 nm. [4] 3. (a) (i) zero; 1 (ii) π or ; 1 (iii) zero; 1 (b) 2nt = ; t = 110 nm; 2 [5] 4. C [1] 5. A [1] 6. C [1] 7. D [1]
DopplerEffect_MS.docx