Name Multiple Choice: Choose the best answer and mark your Scan-Tron form for sc

Question

Name Multiple Choice: Choose the best answer and mark your Scan-Tron form for scorin 1. What is the wavelength of electromagnetic radiation which has a frequency of 5.732 × 1014 s-'? a. 1.718×1023 m b. 1.912× 106m 5.230 × 10.7 m 523.0 m d. e. 5.819×10-15 nm 2. Which radiation has the shortest wavelength? a. FM radio waves b. infrared radiation c. microwave radiation ultraviolet rays e. visible light rays hat is the energy, in joules, of one photon of microwave radiation with a wavelength of 0.158 m? 3. W 1.26 × 10-24 J b. 3.14 x 10-26 J C. 3.19×1025 J d. 3.49 x 10-43 J e. 7.15 x 1040 J 4. Which statement is false? a. Atoms of a given element always undergo the same specific energy changes. b. When an excited atom loses energy, only a specific amount can be lost. c.) When an atom is supplied with energy, an electron drops from a higher energy level to a lower energy level. d. When an electron drops back to a lower energy level, energy equal to the difference between the two levels is released and emitted as a photon. e. The statements above are all true. 5. The letter designation for the electron sublevel in an atom is based on a.) the value of the secondary quantum number, l. the value of the principal quantum number, n c. the value of the magnetic quantum number, mi. d. the value of the spin quantum number, ms Page 2 of 10

Explanation / Answer

Q1

wavelength for v = 5.732*10^14 s^-1

so...

WL = c/v

where c = speed of light = 3*10^-8 m/s

so

WL = (3*10^8)/(5.732*10^14) = 5.23377*10^-7 m

answer is C

Q2.

shortest wavelenght --> larges frequency --> most energy

so..

Radio > microwave > microwave > Visible > ultraviolet

choose UV light

Q3.

1 photon at microwave = 0.158 m

so..

E = hc/WL

h = planck constant = 6.636*10^-34

E = (6.636*10^-34)(3*10^8)/(0.158) = 1.26*10^-24 J/photon

Q4.

C must be false, since addition of energy should increase the level, i.e. it should NOT drop

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