Science Single Award - 4SS0 PearsonEdexcel

Light And Sound

Muhtasari

A straw looks broken where it enters a glass of water. A shout comes back off a distant wall a moment after you make it. A single strand of glass thinner than a hair carries a television channel across an ocean. All three are the same two ideas at work: waves bounce, and waves bend.

This lesson takes reflection and refraction from the ray box on the bench to the fibre under the sea. You will learn the law of reflection, investigate refraction through three different shapes of block, meet the critical angle, and see why sound behaves in exactly the same two ways as light.

Malengo

  1. Know that light waves can be reflected and refracted
  2. Use the law of reflection (the angle of incidence equals the angle of reflection)
  3. Investigate the refraction of light, using rectangular blocks, semi-circular blocks and triangular prisms
  4. Describe the role of total internal reflection in transmitting information along optical fibres and in prisms
  5. Explain what is meant by critical angle
  6. Know that sound waves can be reflected and refracted

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Maelezo ya Somo

Stand at the edge of a swimming pool and the bottom looks shallower than it is. Look at the pool from the far side at a low angle and the surface turns into a mirror, hiding the bottom completely. Nothing about the water changed between those two views; only the angle did. Learning to predict what light does at a boundary, and at what angle it stops doing one thing and starts doing another, is what this topic is for.

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Tathmini ya Somo

Hongera kwa kukamilisha somo la Light And Sound. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.

Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.

Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.

  1. The law of reflection states that: A) the angle of incidence is twice the angle of reflection B) the angle of incidence equals the angle of reflection C) the angle of reflection is measured from the surface D) the angle of reflection is always 90 degrees Answer: B
  2. A ray of light passes from air into glass. It bends: A) away from the normal B) towards the normal C) not at all D) back along its original path Answer: B
  3. Total internal reflection can occur when light travels: A) from air into glass at any angle B) from glass into air below the critical angle C) from glass into air above the critical angle D) from air into glass above the critical angle Answer: C
  4. A ray of light strikes a mirror at 20 degrees to the mirror surface. The angle of reflection measured from the normal is: A) 20 degrees B) 40 degrees C) 70 degrees D) 90 degrees Answer: C
  5. A ray enters a semi-circular block aimed at the centre of the flat face. At the curved surface it: A) bends towards the normal B) bends away from the normal C) does not bend, because it travels along the normal D) is totally internally reflected Answer: C

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Vitabu Vinavyopendekezwa

Pearson Edexcel International GCSE (9-1) Science Double Award Student Book
Pearson Edexcel International GCSE (9-1) Science Double Award Student Book
Manukuu: First edition
Mchapishaji: Pearson Education
Mwaka: 2018
ISBN: 978-0-435-19150-8
Maelezo: Endorsed student book covering the full 4SD0 specification across Biology, Chemistry and Physics.

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