Answer:
6
Explanation:
Formula: Al2O3
If we require 2Al2O3
We divide 2 by 3
Sorry for the shadow of phone and fingers.
The increasing order of photons in terms of energy is Er < Ey < Eb
A photon is a tiny particle of electromagnetic radiation and its energy is proportional to the frequency and rest mass as zero.
By using the formula:
E = h * ν
E = h * c / λ
h = planks constant
c = speed of light
Since h * c is constant
E is inversely proportional to wavelength λ
For blue:
λ = 453 nm
Eb= k / 453
where k is constant
For red:
λ = 660 nm
Er = k / 660
For yellow:
λ = 595 nm
Ey = k / 595
Therefore,
The increasing order of photons in terms of energy is
Er < Ey < Eb.
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Complete question:
Rank the following photons in terms of increasing energy: (a) blue (λ = 453 nm); (b) red (λ = 660 nm); (c) yellow (λ = 595 nm).
Answer:
table A
Explanation:
its table A because it requires less force push. the less force used the less friction there is.
the less friction there is the more smooth a surface is.
It is important to examine both the colour and the streak of a mineral because the streak may be completely different from the colour of the hand specimen.
The streak of a mineral is the color it possesses after it has been grounded to a fine powder. The streak test has to be done on minerals because it is a more reliable way of identifying a mineral with its color.<span />
Answer:
2.1 x 10^24
Explanation:
The number of atoms in a mole will always be the same. The fact that it's lithium is completely irrelevant.
One mole of anything is 6.022 x 10^23 atoms
So if we need to find the number of atoms in 3.5 mol we just need to multiply Avogadro's number by 3.5
3.5 x 6.022 x 10^23
= 21.077 x 10^23
To make it proper scientific notation the first number can't be greater than 10 so let's move the decimal place and increase the exponent
2.1077 x 10^24
Remove the numbers that aren't significant figures
2.1 x 10^24
Boom there's your answer
