1.Light is emitted when a valence electron moves from a lower state to an excite

Question

1.Light is emitted when a valence electron moves from a lower state to an excited state. a.true b.false

2.Light produced from spontaneous emission is incoherent. a.true b.false

3., the wavelength of light color is known to be 527.15 nm; however you obtained 508.37 nm through experiment. What is the percent error? (Percent error can be a positive, negative, or zero value. Please refer to the lab handout for formula)

4. We will use an optical grating in this lab. The grating has 600 evenly spaced slits in 1 mm. What is the separation (in mm) between two adjacent slits?

5.To obtain proper light intensity measurement, the Gain switch on the light sensor must be kept at 100 all the time a.true b.false

Explanation / Answer

1)
Light is emitted when a valence electron moves from a lower state to an excited state. False

2)
Spontaneous emission produces incoherent light : True

3)
% Error = (508.37 - 527.15)/527.15 * 100%
% Error = - 3.56 %

4)
Separation (in mm) between two adjacent slits = 1mm/600 = 0.00166 mm

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