Answer:
Density is a measure of mass per unit of volume. Density is a measure of mass per volume. The average density of an object equals its total mass divided by its total volume.
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Answer:
A) 6.15×10^14 per sec
B)2.5 sec
Explanation:
Wavelength of light = 488 nm
speed of light = 3×10^8 m/s
therefore, frequency of light 
⇒ 
⇒ν= 6.15×10^14 per sec
b) distance between moon and earth = 3.8×10^5 km.
= 3.8×10^8 m
light travel from earth moon and back to earth
therefore, distance traveled= 2× 3.8×10^8 m = 7.6×10^8 m
therefore time= distance/speed
⇒ time= 
= 2.5 sec
So, for a round trip time required is 2.5 sec.
To measure and determine the width of an MP3 player, it would be best to measure units of centimetres, cm. As this would be appropriate.
<u>We are given:</u>
Mass of NaCl in the given solution = 22.3 grams
Volume of the given solution = 2 L
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<u>Number of Moles of NaCl:</u>
We know that the number of moles = Given mass / Molar mass
Number of moles = 22.3 / 58.44 = 0.382 moles
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<u>Molarity of NaCl in the Given solution:</u>
We know that Molarity of a solution = Moles of Solute / Volume of Solution(in L)
Molarity = 0.382 / 2
Molarity = 0.191 M
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