Module 5: Electromagnetic Energy and the Bohr Model of the Atom

Question 1

The energy transmitted by waves that have two components: electric and magnetic field

Answer 1

Electromagnetic Energy

Question 2

Range of energies that electromagnetic radiation can comprise

Answer 2

Electromagnetic Spectrum

Question 3

How electromagnetic energy travels through space

Answer 3

Wave

Question 4

An oscillation or periodic movement that can transport energy from one point in space to another and need not be restricted to travel through matter

Answer 4

Wave

Question 5

characteristics of wave

Answer 5

Wavelength, frequency and amplitude

Question 6

Distance between two consecutive peaks or troughs

Answer 6

Wavelength

Question 7

The number of wave cycle that pas a specific point in space in a specified amount of time

Answer 7

Frequency

Question 8

This is related to the intensity of the wave

Answer 8

Amplitude

Question 9

This consist of an electric field oscillating in step with a perpendicular magnetic field, both are perpendicular to the direction of travel

Answer 9

Electromagnetic waves

Question 10

Speed of a wave through a vacuum

Answer 10

2.998 x 10e8 m/s

Question 11

Formula for speed of a wave

Answer 11

c = wavelength x frequency

Question 12

As wavelength increases, what happens to the frequency and energy?

Answer 12

decreases

Question 13

Who proposed that energy was quantized meaning it could only be absorbed or emitted in a discrete quantities

Answer 13

Max Planck

Question 14

Formula for Quantized energy

Answer 14

E = h x frequency

Question 15

Value of planck’s constant?

Answer 15

h = 6.626 x10e-34 Js

Question 16

States that electron could be ejected from the clean surface of a metal when light having a frequency greater than the threshold frequency was shone on it

Answer 16

Photoelectric Effect

Question 17

Does the incident light need to have more energy than binding energy to eject an electron from a metal?

Answer 17

Yes

Question 18

Formula for Quantized Energy with speed of wave

Answer 18

E = (h x c) / wavelength

Question 19

This happens when a gas is excited at a low partial pressure using an electrical current or heating it

Answer 19

Line Spectra

Question 20

What did Bohr ignored to resolve the atomic paradox for his model of the atom?

Answer 20

classical electromagnetism

Question 21

This school of thought’s prediction was that the orbiting electron in an element would continuously emit light

Answer 21

classical electromagnetism

Question 22

In 1913, he assumed that electron orbiting the nucleus would not normally emit radiation but it would emit or absorb a photon if it moved to a different orbit

Answer 22

Niels Bohr

Question 23

as the energy level (n) decreases, what happen to the absolute value of En?

Answer 23

Increases

Question 24

The more negative the energy (En) the closer it is to what state of the electron?

Answer 24

Ground state

Question 25

Formula for energy of an Electron if n>1

Answer 25

En = -k/n e2

Question 26

the constant k has a value of ?

Answer 26

k = -2.18 x 10 e-18 J

Question 27

When is matter most stable?

Answer 27

With the lowest possible energy for it

Question 28

State of electrons in an atom when they have the lowest energy possible

Answer 28

Ground Electronic State

Question 29

State of electrons when an atom received energy from an outside source causing it to move in a higher energy

Answer 29

Excited Electronic State

Question 30

Formula for Energy (delta E) in relation to n

Answer 30

delta E = k (1/n final e2 - 1/n initial e2)

Question 31

If delta E is negative, what happened to the light and orbital?

Answer 31

It emitted light and went from a higher orbital to a lower orbital

Question 32

If delta E is positive, what happened to the light and orbital?

Answer 32

It absorbed light and went from a lower orbital to a higher orbital