The formula of De Broglie is the following:
![\lambda=\frac{h}{mv}\begin{cases}\lambda=wavelength\text{ (m)} \\ h=Planck\text{ constant =6.626}\cdot10^{-34}Js \\ m=mas\text{s (kg)} \\ \text{v=}velocity\text{ (m/s)}\end{cases},](https://tex.z-dn.net/?f=%5Clambda%3D%5Cfrac%7Bh%7D%7Bmv%7D%5Cbegin%7Bcases%7D%5Clambda%3Dwavelength%5Ctext%7B%20%28m%29%7D%20%5C%5C%20h%3DPlanck%5Ctext%7B%20constant%20%3D6.626%7D%5Ccdot10%5E%7B-34%7DJs%20%5C%5C%20m%3Dmas%5Ctext%7Bs%20%28kg%29%7D%20%5C%5C%20%5Ctext%7Bv%3D%7Dvelocity%5Ctext%7B%20%28m%2Fs%29%7D%5Cend%7Bcases%7D%2C)
Remember that the mass of an electron is 9.11 x 10 ^(-31) kg, so replacing in the formula, we're going to obtain:
![\begin{gathered} \lambda=\frac{6.626\cdot10^{-34}J\cdot s}{9.11\cdot10^{-31}\operatorname{kg}\cdot1.48\cdot10^5\frac{m}{s}}, \\ \lambda=4.91\cdot10^{-9}\text{ m} \end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%20%5Clambda%3D%5Cfrac%7B6.626%5Ccdot10%5E%7B-34%7DJ%5Ccdot%20s%7D%7B9.11%5Ccdot10%5E%7B-31%7D%5Coperatorname%7Bkg%7D%5Ccdot1.48%5Ccdot10%5E5%5Cfrac%7Bm%7D%7Bs%7D%7D%2C%20%5C%5C%20%5Clambda%3D4.91%5Ccdot10%5E%7B-9%7D%5Ctext%7B%20m%7D%20%5Cend%7Bgathered%7D)
The answer is that the wavelength of an electron traveling at 1.48 x 10^(5) m/s is 4.91 x 10^(-9) m.
Answer: 2KI + Cl₂ → 2KCl + I₂
Explanation: This reaction is balanced.
<h2><em>Spymore</em></h2>
I think the answer is
Control centre of the cell
It is more likely to be 9 as pH 8 and above are Alkali (Base) and alkali solutions don't tend to react with metals.
Hope this helps :) ~