Education For All

Thousands of books and articles have been written about survey methodology, but in case you don’t have hours to devote to becoming a guru, here are ten best practices to consider when building and distributing your survey. 1. Make Sure That Every Question Is Necessary You’re building your survey to obtain important insights, so every question in the survey should play a direct part. It’s best to plan your survey by first identifying the data you need to collect and  then  writing your questions. 2. Keep it Short and Simple Respondents are less likely to complete long surveys, or surveys that bounce around haphazardly from topic to topic. Therefore, make sure your survey follows a logical order and that it takes a reasonable amount of time to complete. 3. Ask Direct Questions Vague or poorly worded questions confuse respondents and make your data less useful. Strive for  clear and precise language  that will make your questions easy to answer...

Introduction to Infrared Spectroscopy Chapter 16 Instrumental Analysis Definition of Infrared Spectroscopy w The absorption of light, as it passes through a medium, varies linearly with the distance the light travels and with concentration of the absorbing medium.  Where a is the absorbance, the Greek lower-case letter epsilon is a characteristic constant for each material at a given wavelength (known as the extinction coefficient or absorption coefficient), c is concentration, and l is the length of the light path, the absorption of light may be expressed by the simple equation a= epsilon times c times l. Infrared Spectroscopy w   Infrared spectroscopy is the measurement of the wavelength and intensity of the absorption of mid-infrared light by a sample. Mid-infrared is energetic enough to excite molecular vibrations to higher energy levels. w   The wavelength of infrared absorption bands is characteristic of specific ty...