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Grade 12 Learning ResourcesPhysical Sciences Grade 12 Study ResourcesEMISSION AND ABSORBTION SPECTRA QUESTIONS AND ANSWERS

EMISSION AND ABSORBTION SPECTRA QUESTIONS AND ANSWERS

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EMISSION AND ABSORBTION SPECTRA QUESTIONS AND ANSWERS Emission and absorption spectra are fundamental concepts in the field of spectroscopy, shedding light on the interactions between matter and electromagnetic radiation. From deciphering the composition of distant stars to understanding the behavior of atoms and molecules in our laboratories, these spectra offer invaluable insights. In this Page, we’ll delve into some common questions about emission and absorption spectra to demystify these intriguing phenomena.

  1. What is the approximate wavelength range of visible light? (2)
  2. Name five wavelength ranges and their uses. (5)
  3. How can a scientist tell what elements are present on a star? (3)
  4. What is the approximate wavelength of red light? And violet? (2)
  5. What does the wavelength of UV tell you about its energy levels? (2)
  6. Does microwave radiation or gamma radiation have more energy per photon? (1)
  7. Give one example of a colour in fireworks achieved through emission spectra. (1)
    [16]
Solutions

  1. 400 nm  to 700 nm (One mark per correct value) (2)
  2. Visbile light: to see; Xrays: to inspect bones without surgery; Gamma rays: to kill bacteria; UV: suntanning, helps bees navigate, powers photosynthesis; Infrared: night vision, heat radiation, some lasers; Microwaves: telecommunications, radar, ovens; Radio waves: telecommunications. (any 5) (5)
  3. She can project the light from the star through a spectroscope which splits it into its components. She can then compare the spectrum to known emission spectra of known elements. (3)
  4. Any value 700-600 nm(it’s continuous); Any value near 400-450 nm. (2)
  5. UV has a short wavelength which means that it has high energy levels. (2)
  6. Gamma.  (1)
  7. Cu / Copper: blue / green / cyan / blue-green / turquoise; Strontium / Lithium: Red; Iron / Sodium / Calcium / Na / Fe / Ca: orange / yellow; Magnesium / Mg / Aluminium / Aâ„“: White ; Potassium/K: lilac / violet; Green: Barium / Ba (light green), possibly Copper / Cu (darker green). (any one) (1)
    [16] 

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