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Question

a student wants to determine a student wants to determine a student wants to determine a student wants to determine Ch. Ex. 29c - cp29c_Wavelength from Emission Energy 1 out of 3 attempts Enter your answer in the provided box. Assistan Check M View Hin View Qu Guided S Practice Print Question Report a Consider the following energy levels of a hypothetical atom: E4 = -1.0× 10-19 J E3 = -5.0 x 10- J E2-10 x 1018 J 19 18 When an electron drops from the E3 level to the E 1 level, the atoms are said to undergo emission. Calculate the wavelength (in nm) of the photon emitted in this process. Enter your answer in scientific notation 10 nm References

Explanation / Answer

When electron drops from E3level to E1 level the difference of these energy levels can be emitted.

E = E3 - E1 = (-5.0x10-19)-(-1.5x10-18) J

= 1.0x10-18J

We know that E = hc/v

Where

h = Planck's constant = 6.626x10-34 Js

v = wave length = ?

c = speed of light = 3.0x108 m/s

Plug the values we get v = hc / E = 1.987x10-7 m

= 198.7x10-9 m

= 198.7 nm

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