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lisabon 2012 [21]
3 years ago
14

100 points!! Brainliest if correct!!

Chemistry
2 answers:
irina [24]3 years ago
8 0

First look at the H (that is hydrogen) in the formula. There are 3. This would be right, but notice the 3 at the beginning of the formula. This coefficient tells you to multiply all values by 3. So you multiply the 3 hydrogen atoms by 3, which is 9.

Answer is C: 9

Virty [35]3 years ago
4 0

The answer is C.

While the Hydrogen atom symbol itself is labeled with 3, it is being multiplied by the coefficient of 3, giving us a total of 9 atoms.

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v = 301.62 km/s

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1 eV = 1.6022 × 10⁻¹⁹ J

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Using the equation for photoelectric effect as:

E=\psi _0+\frac {1}{2}\times m\times v^2

Also, E=\frac {h\times c}{\lambda}

Applying the equation as:

\frac {h\times c}{\lambda}=\psi _0+\frac {1}{2}\times m\times v^2

Where,  

h is Plank's constant having value 6.626\times 10^{-34}\ Js

c is the speed of light having value 3\times 10^8\ m/s

m is the mass of electron having value 9.11\times 10^{-31}\ kg

\lambda is the wavelength of the light being bombarded

\psi _0=Work\ function

v is the velocity of electron

Given, \lambda=315\ nm=315\times 10^{-9}\ m

Thus, applying values as:

\frac{6.626\times 10^{-34}\times 3\times 10^8}{315\times 10^{-9}}=5.8961\times 10^{-19}+\frac{1}{2}\times 9.11\times 10^{-31}\times v^2

5.8961\times \:10^{-19}+\frac{1}{2}\times \:9.11\times \:10^{-31}v^2=\frac{6.626\times \:10^{-34}\times \:3\times \:10^8}{315\times \:10^{-9}}

\frac{1}{2}\times 9.11\times 10^{-31}\times v^2=6.31047619\times 10^{-19}-5.8961\times 10^{-19}

\frac{1}{2}\times 9.11\times 10^{-31}\times v^2=0.41437619\times 10^{-19}

v^2=0.0909717212\times 10^{12}

v = 3.0162 × 10⁵ m/s

Also, 1 m = 0.001 km

So, v = 301.62 km/s

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2 years ago
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