is cut-on and cut off wavelength the same

This year, she received the Lurie Prize in Biomedical Sciences from the Foundation for the National Institutes of Health. Already a member of the National Academy of Sciences and an American Academy of Arts and Sciences fellow, Doudna won the inaugural Mildred Cohn Award in Biological Chemistry from the American Society for Biochemistry and Molecular Biology last year (for work she accomplished prior to the CRISPR craze). The method has received much attention in the mainstream press, including the New York Times, which described the adoption of CRISPR by researchers as a “scientific frenzy.”ĭoudna, who is also an investigator with the Howard Hughes Medical Institute, has found herself to be repeatedly sought after as a speaker and has received numerous accolades. The small effort in Doudna’s lab at the University of California, Berkeley, has since exploded into an international one, with laboratories in several continents furiously working on the gene-manipulation possibilities presented by the system. That was before a lightbulb went off, before Doudna and her postdoctoral fellow realized that the bacterial defense system could be exploited to fix faulty genes or bestow new functions on existing genes in all kinds of cells.

Where #h# is Planck's constant, #lambda_text# wavelength of incident light, #phi# work function of the metal and #KE_max# the maximum kinetic energy of the ejected electron(s).įor photoelectric effect to occur, the energy of the photon must be greater than the work function.Īs the wavelength of the incident light decreases but is lower than the cut-off wavelength, the maximum kinetic energy of the photo electrons increases.If you had asked Jennifer Doudna a few years ago about the gene-editing tool CRISPR, she would have described the research as “a pretty small effort in my lab, just a few people having fun checking it out.” We know that speed of light in vacuum #c# is related to its frequency #nu# and wavelength #lambda#Įinstein put forward the following equation:

#E# being energy, #nu#, the frequency of radiated energy and #h# is Planck's Constant. A single photon, whose wavelength is lower than the threshold wavelength for a specific metal, has the required energy to eject one electron thus creating the observed photoelectric effect.Įinstein used Planck's famous expression #E = hnu#, to explain other experimental results of photoelectric effect.

Is cut-on and cut off wavelength the same