Test 4- Quantum Mechanics Flashcards Preview

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Flashcards in Test 4- Quantum Mechanics Deck (17):
1

Electromagnetic Radiation

- The radiation associated with an electric and magnetic field; it varies periodically and travels at the speed of light
- Form of energy that exhibits wavelike behaviors as it travel through space
- Visible light is part of the electromagnetic spectrum
- Visible light is a type of electromagnetic radiation

2

Wavelength

- λ
- The distance corresponding points on an adjacent waves

3

Frequency

- ν
- The number of waves that pass a given point in a specific time, usually one second

4

Speed of light equation

- C=λν
- Speed of light= wavelength times frequency

5

Speed of light number

3.00 x 10^8 ms^-1 or 3.00 x 10^8 m/s

6

Wavelength is measured in

meters

7

Frequency is measured in

- s^-1
- One wave per second is called a hertz
- Therefore s^-1 is a hertz

8

The Photoelectric effect

- The photoelectric effect is when electrons are emitted from a metal when light shines on the metal
- Only certain wavelengths od electromagnetic radiation (light) will cause an electron to be emitted
- Only certain frequencies or wavelength of e.m. (light) will cause an electron to be emitted
- Max Planck proposed that light travelled in little units/packets of energy called quanta

9

Quantum

the minimum quantity of energy that can be lost or gained from an atom

10

Photon

- Einstein called the particles that carried these packets of electromagnetic radiation photons
- A photon is a particle of electromagnetic radiation having zero mass and carrying a quantum of energy

11

Energy in relation to frequency

- E=hv
- Energy= Plancks constant times frequency
- h=Plancks constant=6.626 x 10^-34 Js
- Gamma has a higher energy because it has a higher frequency

12

Spectroscopy

- The branch of science concerned with the investigation and measurement of spectra produced when matter interacts with or emits electromagnetic radiation

13

Continuous spectra

continuous range of frequencies of electromagnetic radiation

14

Line Spectra

a spectrum consisting of discrete frequencies of electromagnetic radiation

15

Emission Spectra

- Aka Bright line spectrum
- results from electrons losing energy when they move an excited state to the ground state

16

Absorption Spectra

- Aka dark line spectrum
- results when electrons absorb energy to move from ground to excited state

17

Emission and absorption

compliment each other