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tigry1 [53]
1 year ago
12

Suppose a metal will eject electrons from its surface when struck by yellow light. What will happen if the surface is struck wit

h ultraviolet light?
a. No electrons would be ejected.
b. Electrons would be ejected and they would have lower kinetic energy than those ejected by yellow light.
c. Electrons would be ejected and they would have the same kinetic energy by yellow light.
d. Electrons would be ejected and they would have greater kinetic energy than those ejected by yellow light.
Chemistry
1 answer:
Marizza181 [45]1 year ago
4 0

Answer:

d. Electrons would be ejected and they would have greater kinetic energy than those ejected by yellow light.

Explanation:

A formula that describes the kinetic energy of an electron ejected when a surface is truck by light is:

  • Ephoton = KineticEnergyElectron + Φ

As you see, the higher the energy of the photon striking the surface, the higher the kinetic energy of the ejected electron.

<em>Ultraviolet light has more energy than yellow light</em>, so it would cause<em> the ejected electron to have greater kinetic energy as well</em>.

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Solution : Given,

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First we have to calculate the moles of CaCN_2.

\text{Moles of }CaCN_2=\frac{\text{Mass of }CaCN_2}{\text{Molar mass of }CaCN_2}=\frac{265g}{80g/mole}=3.2moles

The given balanced reaction is,

CaC_2+N_2\rightarrow CaCN_2+C

from the reaction, we conclude that

As, 1 mole of CaCN_2 produces from 1 mole of N_2

So, 3.2 moles of CaCN_2 produces from 3.2 moles of N_2

Now we have to calculate the mass of N_2

\text{Mass of }N_2=\text{Moles of }N_2\times \text{Molar mass of }N_2

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Hello user, you did not add a picture of an attachment to enable me help you solve this problem. Please check the attachment I added i believe it is the question that needs to be solved.

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