A B Earth.

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Presentation transcript:

A B Earth

Pat’s frame of reference on earth 10 light years Earth 0.8 c star Chris’s frame of reference on spaceship 0.8 c 0.8 c Earth star contracted length

v m inertial observer mass of object m momentum of object p energy of object E m

Mystery of light: dual nature particle / wave

Diffraction circular aperture razor blade rectangular grid

Particle nature of light: photoelectric effect red light does did result in the emission of electrons from the surface of sodium metal surface Particle nature of light: photoelectric effect

Zn Mg Li Cs photoelectrons ejected no photoelectrons ejected infrared visible ultra- violet

ultra-violet light causes electrons to be ejected from the electroscope the leaves become negatively charge and hence repel each

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