Harvard Classification Scheme Class

Color

Prominent spectral lines

Surface Temp. (K)

O

Blue

Ionized helium, hydrogen

> 25,000

B

Blue-white

Neutral helium, hydrogen

11,000 – 25,000

A

White

Hydrogen, ionized sodium, ionized calcium

7,500 – 11,000

F

White

Hydrogen, ionized sodium and calcium; neutral sodium and calcium

6,000 – 7,500

G

Yellow

Neutral sodium and calcium, ionized calcium, ionized iron, ionized magnesium

5,000 – 6,000

K

Orange

Neutral calcium, neutral iron, neutral magnesium

3,500 – 5,000

M

Red

Neutral iron, neutral magnesium, and neutral titanium oxide (not shown)

< 3,500

Use the Harvard Classification Scheme (shown in the table above) to answer the following quesiton: The Sun contains spectral lines from neutral sodium and calcium as well as ionized calcium, magnesium and iron. Of the choices below, which could be the surface temperature of the Sun?

4,200 K
5,800 K
8,900 K
14,300 K

98 points you will be galileo perform the experiment to determine if objects with different mass fall at the same, or different, rates in the air and in a vacuum. before you conduct your experiment, you need to form a hypothesis. a hypothesis is a prediction of what you think will happen in the experiment. the hypothesis is a statement that describes “if” a certain set of circumstances are present “then” there will be a specific result that will occur. record your hypothesis here: record the results from step one of the experiment (dropping the objects in the air): first trial: second trial: third trial: record the results from step two of the experiment (dropping the objects in a vacuum): first trial: second trial: third trial: did the experiment support your hypothesis? using the data from your experiment, describe why you believe your hypothesis was either proven or disproven. what forces were acting on the objects dropped in the air? what force was acting on the objects dropped in the vacuum? part two: comparing forces choose two forces and compare and contrast these forces. you must provide two ways that they are alike and two ways that they are different. you may make a list, write in paragraph form, or make a chart. choose two forces and compare and contrast these forces. these must be different forces than used in the prior question. provide two ways that they are similar and two ways that they are different. you may make a list, write it out, or make a chart.