Edexcel A level Physics Exam Question With 100% Verified Answers,

Coherent - correct answer When two waves have the same wavelength, frequency and a fixed phase difference between them If a wave enters a material with a greater refractive index it refracts... - correct answer Towards the normal (slows down) If a wave enters a material with a lower refractive index it refracts... - correct answer Away from the normal (speeds up) Refractive index from glass to water equals - correct answer Sin(angle of incidence)/sin(angle of refraction) What is polarised light - correct answer Oscillations in a single plane including the plane of propagation To increase the distance between maxima, the number of slits per metre on a diffraction grating should...so d in ny=dsin0 should... - correct answer Increase, decrease A magnifying glass consists of a...lens and the object is ...the focal length so the image is...and... - correct answer Converging, before, virtual, upright Hard - correct answer Difficult to indent surface Stiffness - correct answer How easily a material bends/ gradient of a force extension graph Tough - correct answer Absorbs a lot of energy from shocks without breaking/ large plastic region Brittle - correct answer Shatters when subjected to large impacts/ little or no plastic region Strong - correct answer Withstands a large force without breaking, high breaking stress Malleable - correct answer Can be hammered into thin sheets Ductile - correct answer Can be drawn into thin wires Random - correct answer Cannot tell which nucleus will decay next Binding energy - correct answer Energy equivalent to the mass deficit when nucleons join together to form an atomic nucleus When 90% of the sample has decayed N/No = - correct answer 0.1 ( as 10% of the sample is remaining) Conditions for fusion - correct answer Very high temperatures, pressure, dense, strong magnetic fields Beta minus decay is when - correct answer Neutron turns to a proton and an electron and anti electron neutrino emitted Internal energy - correct answer Sum of the kinetic and potential energy of the molecules within a system