What are the advantages and disadvantages of using quantum dots for fluorescence imaging?

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

Why is 800nm used for the wavelength when measuring the absorbance of the blue copper II sulfate solution?

Why would a chemist using a spectrophotometer need to perform both a scan across all wavelengths and a scan at a specific wavelength?

Describe how the attenuation of X-rays correlate with i) their photon energy, ii) the chemical make-up of the transmission material, and iii) the distance they have travelled through the material.

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…

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Spectrophotometric Determination of Nitrate in Seawaters Explain the relationship between absorbance and concentration Explain the principle behind a UV-Vis spectrophotometer (key components and how it works) Why must the absorbance in this experiment be read at a wavelength of 543 nm?

A student is testing a different concentration of Cu(SO4)2, but finds that his absorbance readings are too high for the instrument. What steps can he take to measure the absorbance accurately?

Food dye spectroscopy  2. At what wavelengths should the readings be taken? What instrumentation will you utilize with a solution of a known dye to determine the wavelength for your analysis?