if a star is moving away from you how does it affect the wavelength of the light waves that reach you?
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Answer:
47.68 x 10²³ or 4.768 x 10²⁴ copper atoms
Explanation:
Given:
Radius of the copper sphere (r) = 0.935 in
<em>First convert the radius from inches to centimeters</em>
1 in = 2.54cm
0.935in = 0.935 x 2.54cm = 2.3749cm
∴ r = 2.3749cm
<em>Calculate the volume of the copper sphere as follows</em>
Volume = [substitute r = 2.3749cm and π = 22 / 7]
Volume =
Volume = 56.108cm³
<em>From the volume and given density, calculate the mass of the copper sphere </em>
mass = density x volume [density = 8.96g/cm³]
mass = 8.96 x 56.108 = 502.73g
<em>From known facts</em>
1 mole of copper = 63.5g of copper = 6.022 x 10²³ copper atoms.
Then,
502.73 g of copper = = 47.68 x 10²³ copper atoms
Therefore, the sphere contains 47.68 x 10²³ copper atoms