Higher Physics - Particles and Waves - Part 2

Cards (11)

photons 
light particles
work function 
the minimum energy required for photoemission to occur
threshold frequency
the minimum frequency of light
coherent waves 
waves with the same frequency, wavelength and velocity
diffraction grating 
a piece of transparent material with many, parallel, closely spaced lines etched into it
refraction 
the change in speed of light as it travels from one medium into another
absolute refractive index (n) 
the ratio of the speed of light in a vacuum to the speed of light in the medium
critical angle 
when the angle of refraction is at 90 degrees
irradiance 
the power per unit area of electromagnetic radiation incident on a surface
point source 
a small, compact source that emits radiation uniformly in all directions
fraunhofer lines 
absorption lines in the spectrum of sunlight

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