Edexcel A level Physics

Brittle

Shatters when subjected to large impacts/ little or no plastic region

When 90% of the sample has decayed N/No =

0.1 ( as 10% of the sample is remaining)

Tough

Absorbs a lot of energy from shocks without breaking/ large plastic region

If a wave enters a material with a lower refractive index it refracts...

Away from the normal (speeds up)

Ductile

Can be drawn into thin wires

Malleable

Can be hammered into thin sheets

Random

Cannot tell which nucleus will decay next

A magnifying glass consists of a...lens and the object is ...the focal length so the image is...and...

Converging, before, virtual, upright

Hard

Difficult to indent surface

Binding energy

Energy equivalent to the mass deficit when nucleons join together to form an atomic nucleus

Stiffness

How easily a material bends/ gradient of a force extension graph

To increase the distance between maxima, the number of slits per metre on a diffraction grating should...so d in ny=dsin0 should...

Increase, decrease

Beta minus decay is when

Neutron turns to a proton and an electron and anti electron neutrino emitted

What is polarised light

Oscillations in a single plane including the plane of propagation

Refractive index from glass to water equals

Sin(angle of incidence)/sin(angle of refraction)

Internal energy

Sum of the kinetic and potential energy of the molecules within a system

If a wave enters a material with a greater refractive index it refracts...

Towards the normal (slows down)

Conditions for fusion

Very high temperatures, pressure, dense, strong magnetic fields

Coherent

When two waves have the same wavelength, frequency and a fixed phase difference between them

Strong

Withstands a large force without breaking, high breaking stress