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Mila [183]
3 years ago
8

0.820 L has a mass of 2.56kg what is the density of this liquid in kg/L

Chemistry
1 answer:
3241004551 [841]3 years ago
8 0

Density ρ=\frac{m}{v}

=\frac{2.56 kg}{0.820 L} \\=3.121kg/L

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The energy of a photon needed to cause ejection of an electron from a photoemissive metal is expressed as the sum of the binding
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Using the expression for the photoelectric effect as:

E=h\nu_0+\frac {1}{2}\times m\times v^2

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\nu_0=\frac {c}{\lambda_0}

Applying the equation as:

\frac {h\times c}{\lambda}=\frac {hc}{\lambda_0}+\frac {1}{2}\times m\times v^2

Where,  

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

\lambda is the wavelength of the light being bombarded

Given, \lambda=4.00\times 10^{-7}\ m

\frac {hc}{\lambda_0} is the binding energy or threshold energy

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Thus, applying values as:

\frac{h\times c}{\lambda}=Binding\ Energy+Kinetic\ Energy

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49.69\times 10^{-20}\ J=Binding\ Energy+6.26\times 10^{-20}\ J

Binding\ energy=43.43\times 10^{-20}\ J

5 0
3 years ago
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