1.
State what is meant by phase difference. [1]
JD SCIENCE
Module 4 Electrons, waves and photons
Answer all questions. Show working. Answers are in a separate file on the Worksheets page — do not look at them until you have finished.
2.
State what is meant by superposition. [1]
3.
State what is meant by Young's double slits. [1]
4.
State what is meant by diffraction grating. [1]
5.
State what is meant by stationary waves. [1]
6.
State what is meant by the first harmonic. [1]
7.
State what is meant by refraction. [1]
8.
State what is meant by optical fibre. [1]
9.
State what is meant by polarisation. [1]
10.
State what is meant by a photon in the photoelectric effect. [1]
11.
Grace is asked about phase difference in a OCR Physics paper.
(a) Describe phase difference. [2]
(b) Explain why phase difference is important in this topic. [3]
12.
Grace is asked about superposition in a OCR Physics paper.
(a) Describe superposition. [2]
(b) Explain why superposition is important in this topic. [3]
13.
Grace is asked about Young's double slits in a OCR Physics paper.
(a) Describe Young's double slits. [2]
(b) Explain why Young's double slits is important in this topic. [3]
14.
Grace is asked about diffraction grating in a OCR Physics paper.
(a) Describe diffraction grating. [2]
(b) Explain why diffraction grating is important in this topic. [3]
15.
Grace is asked about stationary waves in a OCR Physics paper.
(a) Describe stationary waves. [2]
(b) Explain why stationary waves is important in this topic. [3]
16.
Grace is asked about the first harmonic in a OCR Physics paper.
(a) Describe the first harmonic. [2]
(b) Explain why the first harmonic is important in this topic. [3]
17.
w = λD/s. λ=6.0×10⁻⁷, D=1.5, s=0.50×10⁻³ [3]
18.
nλ = d sinθ. n=1, d=2.0×10⁻⁶, θ=18°. λ [3]
19.
First harmonic: L=0.80 m. λ [3]
20.
n = 1.5, c=3.0×10⁸. v in glass [3]
21.
Critical angle if n=1.5 to air [3]
22.
Path difference for the 2nd bright fringe [3]
23.
Grace carries out a OCR-style required practical linked to waves, superposition and optics. This is a typical OCR required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
24.
Grace carries out collecting valid data for waves, superposition and optics. This is a typical OCR required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
25.
Grace carries out drawing a graph for waves, superposition and optics. This is a typical OCR required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
26.
Grace carries out evaluating a method about waves, superposition and optics. This is a typical OCR required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
27.
Compare phase difference with superposition. [4]
28.
Compare superposition with Young's double slits. [4]
29.
Compare Young's double slits with diffraction grating. [4]
30.
Compare diffraction grating with stationary waves. [4]
31.
Apply your knowledge of refraction to this situation: towards the normal if slower [3]
32.
Apply your knowledge of optical fibre to this situation: cladding of lower n [3]