7.2 the nature of matter Flashcards

1
Q

what is planck‘s constant

A

6.626 x 10 to the -34

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2
Q

what is the formula relating placks constant and energy

A

delta E = nhv

n = integer
v = frequency of the electromagnetic radiation absorbed or emmited

energy can be lost for integer values of hv

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3
Q

what is a photon

A
  • a piece of enegie
  • they are quantized, travel in discrete units, not long wavelenghts, discrete little particles
  • they hAVE FIXED ENERGY, QUANTIZED
  • not a particle, but acts like one
    = E photon = (h)(f)
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4
Q

what are the main principles of the photoelectric effect?

A

When piece of metal is bombarded with electrons:
- no electrons are emited below a specific threshold frequency
- light with frequency lower than threshold frequency will not emmit electrons regardless of the intensity of the light
- for light greater than threshold, num of electrons emitied increases with intensity of the light
- kinetic energy of emited electrons also increases linearly with intensity of the light

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5
Q

what is the nuane with the mass of a photon

A

Photon‘s do not actually have a mass, they have an apparent mass, can act as if they have a mass

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6
Q

what is an interferrance pattern (diffraction)

A

when 2 disturbances occur near one another, and their respective series of waves overlap

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7
Q

what is constructive interference

A

resulting wave is bigger than original waves

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8
Q

what is destructive interference

A

resulting wave has an amplitude of 0

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9
Q

for periodic waves how is there a constructive interference, what does it produce

A

when the waves of in phase, alined
produces a bright spot

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10
Q

for periodic waves how is there a destructive interference, what does it produce

A

when the waves are out of phase, (the through of one wave is over the pick of the other) , produces a dark spot

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