Revision chapter 7

1. a rotating arrow representing a wave
2. a continuum of wavelengths
3. particles used in microscopes when they act as waves due to their high velocity
4. 360 degrees in radians
8. effect when electrons are emitted when e-m waves land on metals
11. the unit of frequency
12. how waves act as particles and vice versa
13. higher frequency standing waves
14. the spreading of a wave through a gap or edge
15. electrons exhibit diffraction effects if grating has spacing on an ****** scale
16. packet of energy
17. what phasors do with destructive superposition (4,2)
18. waves can be this if the resultant of two waves travelling in opposite directions
20. the symbol we use for wavelength

1. his constant relates frequency and energy of photons
2. the adding together of two or more wave forms
5. found from the square of the amplitude of the resultant phasor
6. packet of e-m energy
7. Dutch scientist who proposed the idea of wavelets
8. needs to be a whole number of wavelengths for constructive interference (5,10)
9. waves of the same frequency from the same source
10. the longest wavelength standing wave
19. a series of close slits