CH223_Ch_24_Intro_Spectroscopy

13.Which of the following is the reason that a more concentrated dye solution absorbs more light than a less concentrated solution?   A. There are fewer molecules of dye in solution that can absorb electrons, meaning more electrons reach the detector, increasing absorbance.   B. There are more molecules of dye in solution that can absorb electrons.   C. There are more molecules of dye in solution that can absorb isotopes.   D. There are more molecules of dye in solution that can absorb photons, meaning fewer photons reach the detector, increasing absorbance.   E. There are fewer molecules of dye in solution that can absorb photons, meaning more photons reach the detector, increasing absorbance.

1) Whose law is utilized in this lab with regards to solution concentration and absorbance? 2) How many possible energy releasing electron transitions are possible for a single electron in a hydrogen atom if there are 7 orbits available to the electron? 3) An electron in a hydrogen atom transitioning from orbit n = 7 releases a photon whose frequency equals 6.44196  1013 Hz. Determine the orbit to which the electron transitioned.

Lyman series:nf=1  (91<λ<123 nm; near-UV). Balmer series:nf=2  (365<λ<658 nm; visible). Paschen series:nf=3  (819<λ<1877 nm; near-IR). Brackett series:nf=4  (1.456<λ<4.054 μm; short-to-mid-λ-IR) One of the lines in the emission spectrum of the hydrogen atom has a wavelength of λ = 410.4 nm.  Identify the value of nfinal .  Identify the value of ninitial.

Cathode Ray Discharge Tube Demonstration An Exploration (Because of the DANGER involved and the fragile nature of the device, this is a demonstration rather than a true Exploration) Background information: Until recently, almost all televisions used a device known as the cathode ray tube, or CRT, to display the images. In a cathode ray tube, the "cathode" is a heated filament (not unlike the filament in a normal light bulb). The heated filament is in a vacuum created inside a glass envelope or "tube." The "ray" is a stream of electrons that naturally pour off the heated cathode into the vacuum. The Cathode Ray Tube is powered by an extremely high voltage DC current system and is dangerous! Electrons are negative. The anode is positive, so the anode attracts the electrons pouring off the cathode. The electrons hit the phosphorus screen and generate green photons, which we can see. Safety: The cathode ray discharge tube is not a toy and should be handled with a lot of precaution. An…

Remote Spectroscopy.  Spectrometers mounted on aircraft and satellites have been used to obtain spectral information about the earth. How do these systems work? The science behind the technique and its practical applications. Cite specific uses of these remote spectroscopy techniques.  Include illustrations.

Topic:Fluorescence spectroscopy An introduction explaining: what the technique is about, the basic principles/ theory of the technique, and how the instrument or spectrometer works.

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Which main theory did Compton use to explain electron scattering from the metal target?

4) In a game of Clue, Ms. White is murdered in the conservatory. A spectrometer in each room records who is present to help find the murderer. For example, if someone wearing yellow is in a room, light at 580 nm is reflected. The suspects are Col. Mustard, Prof. Plum, Mr. Green, Ms. Peacock (blue), and Ms. Scarlet. At the time of the murder, the spectrometer in the dining room shows a reflection at 520 nm, the spectrometers in the lounge and study record higher frequencies, and the spectrometer in the library records the longest possible wavelength. Who killed Ms. White? Explain.

Please answer question 16 Part A

The frequency range of infrared light used in an IR spectrometer is 1.2x1014 Hz to 1.2x1013 Hz. What is the wavelength range (in nm) used in this spectrometer

The absorbance of various wavelengths of light by a solution were measured. How does absorbance relate to the intensity of light that is transmitted through the solution and measured by the detector?

Your professor selected a wavelength of 430 nm to measure the absorbance of a sample. What is the most likely color of the sample? Which of the following is false regarding spectrophotometry? A sample does not absorb light of its own color but transmits light of its own color A calibration curve can be plotted by using a sample set of unknown concentrations to verify the concentration of  a known sample The concentration of the unknown sample of blue food dye is

Write the electron configuration for atoms of chlorine Cl in their ground state and use it to predict which of the following PES spectra would be generated by these atoms. II 347 29.1 2.38 2.05 37.1 3.93 0,42 239 16.05 100 10 100 10 lonization Energy (MJ/mol) lonization Energy (MJ/mol) II IV 273 20.2 2.44 24.1 2.82 26.8 1.25 31.5 1.52 100 10 100 10 lonization Energy (MJ/mol) lonization Energy (MJ/mol) Number of Electrons Number of Electrons Number of Electrons Number of Electrons

The fluorescent bulb doesn’t just have one kind of element inside it. It has a whole range of compounds selected so that they will emit a lot of different colors. However, there are still gaps in the spectrum. So why does the light still appear white?

What is the frequency (in Hz) of 615 nm visible light? What color is this light?

A laser pulse at 500. nm contains 4.95 mJ of energy. How many photons are in the laser pulse? 1.25 x 1016 8.04 x 10-17 3.98 x 10-19 1.25 x 1019