GCSE Physics Revision: Waves Questions (in 15 minutes)

Here are some GCSE Physics Waves Revision Questions. The questions are OCR Physics however they are applicable to all exam boards including AQA GCSE Physics, Edexcel GCSE Physics, iGCSE, Eduqas etc.

Chapters:
00:00 Q1 - Wavelength
00:56 Q2 - Transverse Waves
01:35 Q3 - Refraction
02:40 Q4 - Refraction and light
05:08 Q5 - Lenses
06:38 Q6 - Ultrasound
08:18 Q6 - Wave Equation
09:35 Q6 - Ultrasound Reflection
12:27 Q7 - Ripple Tank and Tranvserse Waves

[yehyajamal]

For the question about the kidneys, the speed of the ultrasound wave will actually decrease not just because of refraction, because some waves can increase their speed due to refraction. In fact, since ultrasounds are mechanical waves, their speed decreases if they refract from a more refractive medium to a less refractive one. Here the ultrasound waves is going from ceramic (very refractive) to the kidneys (which are less refractive) and as a result their speed decreases. According to the particle model of matter, solids tend to have more packed particles that can transfer sound wave energy faster. The opposite is correct for an EM wave.

[yehyajamal]

Exercise 10:
White light will diffract into its constituent light waves in the prism. Since all EM waves will propagate in the same speed in the same medium, then option B must be wrong. The speed of EM waves depends on how refractive or optically dense the medium is. However, since both blue and red lights will have the same speed in the prism, and as speed = wavelength x frequency, therefore the wavelength and the frequency must be inversely proportional. The higher the frequency of an EM wave, the smaller the wavelegth. Since the blue light tends to deviate more towards the normal, then its frequency should be higher than that of the red light. As a result, options A, B and even C should all be wrong. However, option C says "frequency change" and I have no idea what that actually means. Because the white light already contains the blue and the red lights and each doesn't change frequency when it emerges from one medium to another. Anyway, I would still go with option D here. I would love if anyone can comment. Thanks

[Zodi-otjl]

Thank you sir, its a great video
But can you do like grade 8 or 9 questions with model answers

[roccorichards]

your answer to Q4 B is incorrect. It should show diffuse reflection where the light rays are scattered, not where the incidence ray is equal to the reflected ray

[milanz]

This was sooo helpful, could you please go over global challenges P8?

[Zodi-otjl]

Can you also do maths questions in chemistry plz