Chemistry, 06.05.2020 03:16 ligittiger12806
Biological specimens are often examined by microscopy. However, microscopy with visible light is limited to viewing details of a specimen on the order of the wavelength of light (400 nm). The macromolecules that make up the cell are much smaller, often about 2-10 nm in size, and the interatomic bonds that make up the molecular structure are about 0.2 nm in length. One method that can be used to reveal the atomic-level details of biological molecules is electron microscopy, in which a beam of electrons is focused onto a biological sample. Modern electron microscopes can emit a beam of electrons with a velocity of 1.5×108m/s.
a. What is the wavelength of an electron particle in this beam? Is the wavelength short enough to reveal molecular details at the atomic level?
b. The wavelength of the particle determines the resolution of the microscopy that can be performed. Assume that you desire a minimum uncertainty in the position of the electron of 1.0 Ǻ, -10 m. Using the uncertainty principle, what is the max imumuncertainty that is accept able in the momentum of the particle?
Answers: 1
Chemistry, 21.06.2019 14:30
Urea, co(nh2)2, is manufactured on a large scale for use in producing urea-formaldehyde plastics and as a fertilizer. what is the maximum mass of urea that can be manufactured from the co2 produced by combustion of 1.00 x 104 grams of co2?
Answers: 1
Chemistry, 21.06.2019 20:30
The speed of light is around 6.706×10^8 miles per hour. what is the speed of light in units of miles per minute?
Answers: 2
Chemistry, 22.06.2019 03:10
Between 2014 and 2016, more than 25,000 children in flint, michigan, drank water that was contaminated with lead from lead pipes. during this time, the city claimed the water was safe to drink. which of these actions could the city have taken to ensure that the drinking water was free from lead?
Answers: 3
Biological specimens are often examined by microscopy. However, microscopy with visible light is lim...
Mathematics, 03.03.2020 18:53
History, 03.03.2020 18:53
Mathematics, 03.03.2020 18:53
English, 03.03.2020 18:53
Mathematics, 03.03.2020 18:54
Computers and Technology, 03.03.2020 18:54