Unit 1 topic A Flashcards

this is the topic that was just physics

1
Q

what is the electromagnetic spectrum

A

It is the different types of radiation arranged in order of wavelength

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2
Q

what happens to radiation absorbed or emitted by matter

A

it behaves like a stream of particles and these particles are known as photons

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3
Q

what does a photon carry

A

it carries quantized energy proportional to the frequency of radiation

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4
Q

what can electromagnetic radiation be described in terms of

A

waves and characterised in terms of wavelength or frequency

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5
Q

what happens when energy is transferred to atoms

A

the electrons within the atoms may be promoted to higher energy levels

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6
Q

when does an atom emit a photon of light energy

A

when an excited electron moves from a higher energy level to a lower energy level

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7
Q

what provides direct evidence for the existence of discrete energy levels

A

when the light energy emitted by an atom produces a spectrum that is made up of a series of lines at discrete energy levels

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8
Q

in emission spectroscopy what is used to excite the electrons

A

high temperatures

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9
Q

in absorption spectroscopy what is directed at an atomised sample

A

electromagnetic radiation

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10
Q

what happens when a photon is absorbed or emitted within a substance

A

energy is gained or lost within the substance

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11
Q

what happens in emission spectroscopy when the electrons get excited

A

electrons drop to lower energy levels and photons are emitted

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12
Q

what is absorbed as electrons are promoted to higher energy levels

A

Radiation

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13
Q

how is an absorption spectrum produced

A

by measuring how the intensity of absorbed light varies with wavelength

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14
Q

how can you tell which element is more concentrated in atomic spectroscopy

A

the intensity of the light emitted or absorbed

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