Question

bohrs model & em spectrum- notes

1. which type of energy has the longest wavelength? which type of energy has the shortest wavelength?
2. what electromagnetic wave has the lowest frequency on the visible spectrum? how do you know?

visible spectrum

1. what electromagnetic wave has the highest frequency on the visible spectrum? what did you look at to be able to tell?
2. using the picture below label the arrows showing the increasing energy, increasing wavelength, and increasing frequency.
3. electrons in bohrs model of the atom

a) swirl in an electron cloud
b) have no specific coordinate
c) are combined with the nucleus
d) circle the nucleus in a fixed orbit

Explanation:

Step1: Recall EM - spectrum properties

In the electromagnetic spectrum, radio waves have the longest wavelength and gamma - rays have the shortest wavelength.

Step2: Identify lowest - frequency visible light

On the visible spectrum, red light has the lowest frequency. This is because frequency and wavelength are inversely related ($c = \lambda
u$, where $c$ is the speed of light, $\lambda$ is wavelength and $
u$ is frequency), and red light has the longest wavelength among visible lights.

Step3: Identify highest - frequency visible light

Violet light has the highest frequency on the visible spectrum. We can tell from the visible spectrum diagram where violet has the shortest wavelength among visible lights and using the $c=\lambda
u$ relationship.

Step4: Label arrows for EM - spectrum properties

For increasing energy: Gamma rays > X - rays > Ultraviolet > Visible > Infrared > Microwaves > Radio waves. So the arrow for increasing energy points from radio waves to gamma rays. For increasing wavelength: Gamma rays < X - rays < Ultraviolet < Visible < Infrared < Microwaves < Radio waves. So the arrow for increasing wavelength points from gamma rays to radio waves. For increasing frequency: Radio waves < Microwaves < Infrared < Visible < Ultraviolet < X - rays < Gamma rays. So the arrow for increasing frequency points from radio waves to gamma rays.

Step5: Recall Bohr's model

In Bohr's model of the atom, electrons circle the nucleus in a fixed orbit.

Answer:

1. Radio waves have the longest wavelength and gamma - rays have the shortest wavelength.
2. Red light has the lowest frequency on the visible spectrum because it has the longest wavelength among visible lights.
3. Violet light has the highest frequency on the visible spectrum as it has the shortest wavelength among visible lights.
4. Arrow for increasing energy: from radio waves to gamma rays; Arrow for increasing wavelength: from gamma rays to radio waves; Arrow for increasing frequency: from radio waves to gamma rays.
5. d) Circle the nucleus in a fixed orbit.