New nuclear mass number and subtract smaller than the original 4, but reduced the charge number 2, with the general formula is expressed as: α decay: the nucleus emit a β particle say it happens a β-decay, the new nuclear mass number unchanged , while the charge number increases by 1, with the general formula is expressed as: β decay: ray often is accompanied by α and β decay resulting from decay, often due to decay after the new low-level nuclear radiation out of a transition when the energy of the nucleus emit a photon does not change its mass number and charge number. Definition: radioactive decay of nuclei with half of the time called the half-life. The formula: N = N than the original () t / T m = m more than the original () t / T. The effective range of green laser pointer is the important information.
Narrow the sample on lead weights on the bottom of the hole, placed in the hole opposite the photographic film, in the absence of a magnetic field, discovered in the film is sensitive to the location of the hole. If the film in the lead weights and put one pair between the pole, so that the magnetic field perpendicular to the direction with the rays, resulting in three places on the photosensitive film, and shows the magnetic field, radiation is divided into three beams, charged that some of these rays Some are not charged, as shown, consists of three particles. The customer is fond of the bottle shape green laser pointer .
and determine the amount and quality of its charge, know that it is the hydrogen nucleus, it is called the proton (p), then people would played from the other protons in the nucleus, so to determine the proton is part of the nucleus. Positively charged proton, an electron charge and the amount of electric charge equal to the proton mass mp = 1.672623 1 × 10-27kg. In 1920 Rutherford proposed a bold guess: in addition to protons outside the nucleus. The green laser pointer company gets more orders of green laser pointer this year.
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