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Hi IGCSE,
I have doubts in the chapter of Light and i get confused in drawing the ray diagrams in various mediums and in lens. Could you please provide with some notes which could hel me as my IGCSE’s start next month.
Hello Riya,
Light is a transverse wave that can be reflected, refracted, and diffracted. When a light ray strikes a plane mirror, the direction of the incident ray and the reflected ray is described in terms of the angle of incidence or angle of reflection the will serve as a guide in drawing ray diagrams. We hope this will help and remember that we are here for you.
Best regards,
Physics Department
My question is about alternate to practical question. What is the experimental limit of accuracy range when calculated by formula(experimental value-true value)/true value *100% ?
Also in case of investigating rate of cooling of hot water with different insulation, should we use copper can or glass beaker? Please explain the choice.
Thank you
Nawal
Hello Nawalamir. Experimental accuracy can be reported in terms of percent error. In the laboratory setting, 10 to 15% is acceptable. However, the final decision will be given by the exam board. We hope this helps.
Best regards,
Physics Department
Okay. Can you comment about the second part of my question??. Thanks
Hello Nawalamir,
For the second part of your question which is about investigating the rate of cooling of hot water with different insulation, you should consider the thermal conductivity of the materials used and the temperature change at a given time. A higher temperature difference would mean a higher rate of heat transfer and a lower temperature difference would have a lower rate of heat transfer. Hope this will help and we are here for you.
Best regards,
Physics Department
Thank you again, and please last bit of clarification that is if I choose copper it will conduct heat efficiently and only the rate of cooling will b affected by insulation’s used ,temp of water and room will effect, whereas in case of glass it is a good insulator itself , so rate of cooling will b affected by glass and insulations both, so we should select copper can through out the experiment. Thus rate of cooling is only affected by temperatures and insulations. Am I correct? Thank you again
Dear Nawalamir,
You got the idea about the effect of temperature and the type of insulating material. In addition, if you are given with temperature data, comparing the temperature difference for each material will get you on the right track. Hope this will help. We are here for you.
Best regards,
Physics Department
i am having problem in kinematics
Hello Tahmid,
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Hi
I’m struggling with Physics. I don’t understand these topics very well: Scalar and Vector, Thermal Physics.
Hello Erna,
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Hello,
I can’t find the posted videos of free revision lessons…which u r directing that they posted… Kindly tell me where r all those videos…
Hello Paawanjoy,
The free videos are posted for a limited time only. Please kindly wait for the next schedule. We suggest that you subscribe to our newsletter to get notified.
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