Lesson specific resources
Triple Revision resources
To download past paper mark schemes download the items below.
Notes on CGP past paper SET A
- Notice the detail needed for the description of a smoke alarm: http://www.passmyexams.co.uk/GCSE/physics/alpha-particles-in-smoke-detectors.html
- Make sure you are aware of the difference between geostationary and low polar orbit satellites and their uses: http://www.astarmathsandphysics.com/gcse_physics_notes/gcse_physics_notes_satellites_in_polar_orbits.html and http://www.astarmathsandphysics.com/gcse_physics_notes/gcse_physics_notes_satellites_in_geostationary_orbits.html
- Make sure you can explain young's double slit experiment and also how this would apply to sound (the lesson where you walked across the room and heard loud and quiet sounds from two speakers) http://www.studyphysics.ca/newnotes/20/unit04_light/chp1719_light/lesson58.htm You do not need to know the maths, don't worry, just the explanation: Waves diffract through the slits and some arrive at the screen peak to peak and add up called constructive interference = bright (loud) spot. Other waves arrive at the screen peak to trough (due to diffraction) and cancel each other out called destructive interference = dark (quiet) spot. Constructive interference = peak to peak = maximum intensity. Destructive interference = peak to trough = minimum intensity)
- There is a nasty question about refractive index testing your knowledge in quite a complex way. this site might help, http://www.passmyexams.co.uk/GCSE/physics/total-internal_reflection.html The question is getting at the point that a higher refractive index means light is bent by a greater amount so a smaller incident angle is required to get total internal reflection. If the angle is less then more light will be totally internally reflected. This one is a tough question.
- The final very tough question is question 7 and this is an A* question which is basically just some clever maths. Look through the mark scheme, we can go over this in next weeks timetabled lessons.
Notes on CGP past paper SET B
- Additinal information on the orbit of a comet http://www.bbc.co.uk/schools/gcsebitesize/science/ocr_gateway_pre_2011/living_future/7_threats_to_earth1.shtml AND http://www.gcsescience.com/pun25.htm
- Application of inverse square law http://hyperphysics.phy-astr.gsu.edu/hbase/forces/isq.html#isqg Scroll down to gravity
- The question about transmission of signals using electromagnetic waves requires you to be able to describe how electromagnetic waves with different frequencies behave in the atmosphere:
- Below 30 MHz are reflected by the ionosphere
- Above 30 GHz, rain, dust and other atmospheric effects reduce the strength of the signal due to absorption and scattering
- Between 30 MHz and 30 GHz can pass through the Earth’s atmosphere.
- http://wifiinschools.org.uk/15.html This link may also help wit your understanding. You will need to remember the frequencies that can pass through the atmosphere and those that are either reflected or scattered.
- For the ray diagram this is again a case of remembering the rules (1st draw line from the top of the image through the optical centre, 2nd draw a line from the top of the image to the middle of the lens and then down through the focal point. If the lines do not meet it is because the object is closer than the focal point so a magnified virtual image is produced in the lens. Carry on the lines until they DO MEET the same side of the lens as the object. If the image was at the focal point or beyond it then you would draw the real image on the other side of the lens inverted where the two lines meet ( See the P5 page for more)
- The rest I think the mark scheme is self explanatory.
- Any difficulties please speak to me.