How many molecules are in 4.2 miles of water?
1 answer:
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Answer:
Kinetic energy:
Velocity:
Explanation:
From the equations of the photo-electric effect,
We know:
Where,
1. is the Planck's constant which is
2. are the frequency of light emitted and threshold frequencies respectively.
3. is the kinetic energy of the electrons emitted.
By fact, we come to know that the threshold frequency of Zn is 300nm
And also
Where ,
1. is the speed of light
2. is the wavelength.
Thus,
Now to find velocity:
Answer:
Explanation:
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In this case, according to the given chemical reaction, it is first necessary to compute the moles of reacting LiOH given its molar mass:
Thus, since there is a 1:1 mole ratio between lithium hydroxide and silver nitrate (169.87 g/mol) the resulting milligrams turn out to be:
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