Satellites are placed into orbit at least 150 km above Earth's surface to be above the atmosphere.
Answer:
different number of mass numbers.
Explanation:
isotopes are atoms of the same element having the same atomic number but different mass numbers due to different number of neutrons.
The light will bend when in
Answer:
As the concentration of a solute in a solution increases, the freezing point of the solution <u><em>decrease </em></u>and the vapor pressure of the solution <em><u>decrease </u></em>.
Explanation:
Depression in freezing point :
![\Delta T_f=K_f\times m](https://tex.z-dn.net/?f=%5CDelta%20T_f%3DK_f%5Ctimes%20m)
where,
=depression in freezing point =
= freezing point constant
m = molality ( moles per kg of solvent) of the solution
As we can see that from the formula that higher the molality of the solution is directly proportionate to the depression in freezing point which means that:
- If molality of the solution in high the depression in freezing point of the solution will be more.
- If molality of the solution in low the depression in freezing point of teh solution will be lower .
Relative lowering in vapor pressure of the solution is given by :
![\frac{p_o-p_s}{p_o}=\chi_{solute}](https://tex.z-dn.net/?f=%5Cfrac%7Bp_o-p_s%7D%7Bp_o%7D%3D%5Cchi_%7Bsolute%7D)
= Vapor pressure of pure solvent
= Vapor pressure of solution
= Mole fraction of solute
![p_s\propto \frac{1}{\chi_{solute}}](https://tex.z-dn.net/?f=p_s%5Cpropto%20%5Cfrac%7B1%7D%7B%5Cchi_%7Bsolute%7D%7D)
Vapor pressure of the solution is inversely proportional to the mole fraction of solute.
- Higher the concentration of solute more will the be solute's mole fraction and decrease in vapor pressure of the solution will be observed.
- lower the concentration of solute more will the be solute's mole fraction and increase in vapor pressure of the solution will be observed.
Answer:
f = 0.5 Hz
Explanation:
frequency = f
wave length = l
speed of wave = v
f = v/l → f = 3/6 = ½ = 0.5 Hz