1-6 please and thank you! Name Date Desk Laboratory Instructor Atomic Spectra 12

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1-6 please and thank you!

Name Date Desk Laboratory Instructor Atomic Spectra 12 Pre-lab Questions and Atomic Structure following questions. periment in the laboratory, you should be able to answer the 1. Name the e colors of visible light beginning with that of lowest energy (longest wavelength). 2. Distinguish between absorption and emission of energy 3. A system proposed by the U.S. Navy for underwater submarine communication, called ELF (for extremely low frequency), operates with a frequency of 76 Hz. What is the wavelength of this radiation in meters? In miles? (1 mile = 1.61 km) 4. What is the energy in joules of the frequency given in question 3? en light have wavelengths of about 650 nm and 490 nm, respectively. Which light has the 5. Red and gre y- red or green? Which light has the higher energy -red or green? at 285 nm. Could a spectroscope be used to detect this emission? 6. Mg emits radiation

Explanation / Answer

1) Longest wavelength and lowest energy can exhibit by red color of visible light.

2) Absorption and emission both are associated with electron transitions within the energy levels of an atom. The electrons residing in the lower energy levels carry lower energy and the higher energy levels carry higher energy. So an electron in a lower energy level has to absorb energy in order to excite to a higher energy level and similarly an electron in a higher energy level has to emit an equivalent amount of energy in order to move down to a lower energy level. This is the main difference between absorption and emission.

3) Given that the frequency of radiation, = 76 Hz = 76 s-1

c = 3.0x108 m s-1

Wavelength, = c/ = (3.0x108 m s-1)/ 76 s-1

= 3.947 x106 m = 3947 km

We know 1 mile = 1.61 km

Converting 3947 km to miles: 3947/1.61 = 2451.5 miles

Wavelength of radiation is 2451.5 miles

4) Energy of radiation, E = h = (6.625x 1034 Js)x(76 s-1)

E = 5.035 x 1036 J

5) Given that the wavelength of red light = 650 nm

Wavelength of green light = 490 nm

We know that wavelength is inversely proportional to frequency. So green light has the higher frequency. Frequency is directly proportional to energy, so green light has the higher energy.

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