Alpha particles. Alpha particles are made of 2 protons and 2 neutrons. This means that they have a charge of +2, and a mass of 4. (the mass is measured in atomic mass units, where each proton & neutron=1) We can write them as , or, because they're the same as a helium nucleus, . Alpha particles are relatively slow and heavy.
For more, visit TIME Health. 1  The average attention span for the notoriously ill-focused goldfish is nine seconds, but according to a new study from Microsoft Corp., people now generally lose concentration after eight seconds, highlighting the affects of an increasingly digitalized lifestyle on the brain.
Some psychologists claim the typical student s attention span is about 10 to 15 minutes long, yet most university classes last 50 to 90 minutes. Studentsâ attention levels vary widely based on factors like motivation, emotion, enjoyment, and time of day.he Average Attention Span. Despite the popular belief that students have âshortâ attention spans ranging from 10 to 15 minutes, there is considerable evidence to suggest otherwise. In a 2007 literature review, psychologists Karen Wilson and James H. Korn concluded there is little evidence to support this belief.