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.
[â¦] The average attention span of an audience is 7 minutes. Thus, the audience â students and business people alike â will only pay attention to a topic for 7 minutes, after that a change should be made to maintain audience attention.f people have a short break, then they can start over with another 7- to 10-minute period, but 7 to 10 minutes is the longest block of time they will pay attention to any one presentation. WHY IGNITE! AND PECHA KUCHA ARE SO POPULAR.