Answer:
Written in Python:
fruit_dictionary = {}
fruit_dictionary = {'apple': 'red', 'orange': 'orange', 'banana': 'yellow'}
Explanation:
First (although, not necessary), we create an empty dictionary named fruit_dictionary on line 1
Next, we populate the dictionary using the following syntax:
{key-1:value-1, key-2:value-2,......,key-n:value-n}
In this case, the entry would be:
{'apple': 'red',
'orange': 'orange',
'banana': 'yellow'}
The items on the first column (i.e. apple, orange and banana) are the keys while the items on the second (i.e. red, orange and yellow) are the values of the dictionary
To print the items in the dictionary, you can add the following line of code:
<em>print(fruit_dictionary.items()) </em>
Nicephore Niepce created the first photograph.
Answer:
a) D = 4.88 * 10^(-14) m^2 / s
b) <em>t </em>= 1.1 hr
Solution:
a) Magnesium in Aluminum diffusion:
D = Do * exp(-Qd / RT)
= (1.2 * 10^(-4) m^2 / s) * exp ( - 130,000 / 8.31 * 723.15)
= 4.88 * 10^(-14) m^2 / s
D = 4.88 * 10^(-14) m^2 / s
b) The composition remains same at say the distance Xo:
(Cx - Co) / (Cs - Co) = Constant
Xo^2 / D_{550} * <em>t </em>= Xo^2 / D_{450} * 15
D_{550} * <em>t </em>= D_{450} * 15
(1.2 * 10^(-4) m^2 / s) * exp ( - 130,000 / 8.31 * 723.15) * <em>t</em>
(4.88 * 10^(-14) m^2 / s) * 15
by, solving for <em>t </em>we get:
<em>t </em>= 1.1 hr
So, the time required is 1.1 hr.
Answer:
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