Light and Electrons

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  • Created by: J.E.C.
  • Created on: 21-04-14 14:35
Like all electromagneic radiation light behaves like a ___ with a characteristic ___ and ___?
Wave, frequency, wavelength
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The speed of light is represented by _ and the value is ___ when light is travelling in a vacuum?
c, 3.00 x 10^8 msֿֿֿ-¹
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This speed is the same for all ___ ___? Give the symbol for wavelength and frequency?
Electromagnetic radiation, λ,ν
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Frequency tells us...?
The number of cycles a wave goes through every second.
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Show th relationship between c and λ,ν?
c = λν
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Considering the particle theory of light, the energy of photons is related to...?
The position of light in the EM spectrum.
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What equation shows the link between the wave and particle theory of light?
E=hv
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What is h?
Planck Constant = 6.63x10^34
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When excited atoms lose energy and return to their __ __, the energy is often emitted as __ __?
Ground state, electromagnetic radiation
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The emitted light can be split up into an atomic spectrum by passing it through a __ or a __ __?
Prism, diffraction grating
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This type of spectrum is an ___ spectrum because it arises from light emitted by ___ ___?
Emission, excited atoms
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Describe the appearance of the emission spectrum?
A series of coloured lines on a black background. The coloured lines correspond to the wavelength of light emitted by the atoms in the sample.
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The absorption spectrum arises from...?
Light that has been absorbed by atoms.
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The sequence of lines in an atomic spectrum is characteristic of...?
The atoms in that element that gave rise to it?
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The intensities of the lines provides a measure of the element's ___?
Abundance
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What is the Lyman series?
Emission spectrum of Hydrogen atoms in the UV region.
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Bohr's theory explained why...?
The Hydrogen atom only emits a limited number of specific frequencies.
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Bohr's theory made use of the idea of ___ of ___? According to Bohr's theory, the electron in the H atom is allowed to exist only in certain definite...?
Quantisation, energy. Energy levels
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What other 3 points came about from Bohr's theory?
1. Photon of light emitted or absorbed when e moves energy level 2.Energy of photon=difference between energy levels(ΔE) 3.Frequency related to ΔE because ΔE=hv.
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Explain what is meant by quantisation of energy?
An electron can only possess definite quantities of energy, or quanta.
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The larger the gap (ΔE) between energy levels, the higher the ___ of __ radiation emitted?
Frequency, electromagnetic
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As energy increases, the levels become more ___ spaced until they..? After this point the electron has ___ the atom and it is said to have been ___?
Closely, converge. Escaped, ionised
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The energy difference between the ground state and the point where the energy levels converge is known as...?
The ionisation energy (enthalpy).
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Other cards in this set

Card 2

Front

The speed of light is represented by _ and the value is ___ when light is travelling in a vacuum?

Back

c, 3.00 x 10^8 msֿֿֿ-¹

Card 3

Front

This speed is the same for all ___ ___? Give the symbol for wavelength and frequency?

Back

Preview of the front of card 3

Card 4

Front

Frequency tells us...?

Back

Preview of the front of card 4

Card 5

Front

Show th relationship between c and λ,ν?

Back

Preview of the front of card 5
View more cards

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