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3. Waves
A section of Physics, 0625
Listing 10 of 1440 questions
shows a ray of red light entering a semicircular glass block. The ray strikes the flat surface of the block at X and emerges into the air. does not show the path of the refracted ray in the air. X normal air glass ray of red light On : draw the path of the refracted ray in the air mark, and label with the letter i, the angle of incidence mark, and label with the letter r, the angle of refraction. When the angle of incidence at X is 70°, the ray does not emerge from the glass into the air. State what happens to the ray at X and explain why this happens. Visible light is one part of the electromagnetic spectrum. X‑rays are also part of the electromagnetic spectrum. Visible light and X‑rays are travelling through a vacuum. Compare their speed and frequency by completing the sentences. The speed of visible light is the speed of X‑rays. The frequency of visible light is the frequency of X‑rays. Describe one use of X‑rays.
0625_w21_qp_31
THEORY
2021
Paper 3, Variant 1
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shows a ray of light approaching face AB of a glass prism of refractive index 1.5. ray of light B C A On , accurately draw the path of the ray within the prism from face AB to face AC. You will need to make a measurement from and carry out a calculation. Determine the angle of incidence of this ray when it strikes face AC. angle = Without further measurement or calculation, sketch on the approximate path of the ray after passing through the face AC. shows a ray of light travelling within an optical fibre. X ray of light optical fibre Complete the path of the ray of light to the left-hand end of the fibre. Name the process taking place at X.
0625_w21_qp_42
THEORY
2021
Paper 4, Variant 2
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The refractive index n of glass in air is 1.5. State the equation that relates the speed of light in air va, the speed of light in glass vg and n. The speed of light in air is 3.0 × 108 m / s. Calculate the speed of light in glass. speed = Light travelling in glass strikes the edge of the glass. shows a ray of light at an angle of 41° to the normal. 41° air glass normal The light passes from the glass into the air. Calculate the angle that the ray makes with the normal in the air. angle = State what happens to light that strikes the edge of the glass at an angle to the normal much larger than 41°. Describe one example of how optical fibres are used in medicine.
0625_s15_qp_32
THEORY
2015
Paper 3, Variant 2
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The speed of light in air is 3.0 # 108 m / s. The speed of light in a transparent liquid is 2.0 # 108 m / s. A ray of light is incident on the surface of the liquid at an angle of incidence of 40°. Calculate the refractive index of the liquid, refractive index = the angle of refraction in the liquid. angle of refraction = shows a side view of an object at the bottom of a tank of liquid. Light travels slower in this liquid than in air. tank eye air liquid object On , draw two rays from the object into the air. Use these rays to locate the image. Label this image I.
0625_s17_qp_42
THEORY
2017
Paper 4, Variant 2
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Questions Discovered
1440