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STRC0345: The Visible Dete Section Name Pre-Laboratory Assignment 1. Read MISC 327, Graphical Representation of Data, in this series or another authoritative source for a discussion of graphing techniques 2. Why should you not touch the holder or discharge tube while the power supply to the gas tube is on? 3. The element sodium, after having been excited electrically, emits an amount of energy equal to 3.37 x 10-19 J atom (1) Calculate the wavelength of this light. in answer (2) In what region of the electromagnetic spectrum would the emission fall? Briefly explain. b m (3) If the light is colored, what color is it?

Answer 1

SOL: +27 We should not have to touch the holder or discharge tube while the power supply to the gas tube is on because the gas discharge tubes become extremely hot when used with power supplies. Another reason for this is you could recieve a shock as well. 31. Given:t when sodium is excited Electrically i it emits an Energy Energy = 3.37x10-19 latom We know; Energy he wheree h= planch's constant = 6.626 X 10-34 Js) (=3x108 mis.

Equating he = 3.37810-19 latom 6.626 X 10-34 x 3X108 = 3.378 10-19 a d = 5908109 m. [2=5g0om/ Hence, Wavelength of this light = 590nm. (6) In visible region of the Electromagnetic spectrum would be the Emission fall. As wavelength of visible light is between 400nm to 700 nm. (2) right observed by us is yellowish- orange. Because orange wavelength 590-625 nm yellow wavelengh 565-590 nm Most light is of orange colour
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