Let's first Find the frequency. Energy E and frequency ν are related by the Equation E = hν, where h is the constant of Planck h = 6.63 * 10^-34 J.s
By hypothesis, E = 5.09*10^19 J
E = hv so v = E/h = (5.09*10^-19) / (6.63 * 10^-34) ≈ 7.677 * 10^14 s.
Now Wavelength λ = celerity c / frequency ν, where c = 3 * 10^8 m/s
So λ = (3*10^8) / (7.677 * 10^14) ≈ 3.907 * 10^-7 m = 390.7 nm
Hope this Helps! :)
The number 4 in the 4/2He indicates the atomic mass number of helium.
Answer: Option 3
<u>Explanation:
</u>
The elements present in periodic table generally represented as 
. Here X will be the element in the periodic table, A is the atomic mass number of the element X and Z is the atomic number of the element X.
So, the number 4 is the atomic mass number of He and He-4 is the stable isotope of helium which can also be termed as alpha particle.
Mass number = number of protons + neutrons count.
Thus the number 4 denotes the Helium's atomic mass number.
Answer:
148.2 g of H20
Explanation:
Equation of reaction: 4NH3 + 5O2 ---> 4NO + 6H20
From the equation above, 4 moles of ammonia reacts with 5 moles of oxygen gas to produce 6 moles water.
Molar mass of NH3 = 17 g/mol;
Molar mass of O2= 32 g/mol;
Molar mass of H2O = 18 g/mol
First, we determine the limiting reactant:
4*17 g of NH3 reacts with 5*32 g of O2
Mass Ratio = 68 : 160
Therefore, NH3 is the limiting reactant.
68 g of NH3 reacts to produce 6* 18 g of H20 = 108 g of H2O
93.3 g of NH3 will react to produce (93.3 * 108)/68 g of H20 = 148.2 g of H2O
Therefore, the maximum amount of H2O produced = 148.2 g
Answer:
gravity, magnetic, electrostatic
B,c and f are true,but I doubt about g cause I don't know anything about electron's dimention
