200分求一道物理题 求懂英文的高手啊Strontium-89 is a radioactive isotope with an atomic number of 38.How many protons and how many neutrons are present in the nucleus of this isotope?Number of Protons =Number of Neutrons =

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200分求一道物理题 求懂英文的高手啊Strontium-89 is a radioactive isotope with an atomic number of 38.How many protons and how many neutrons are present in the nucleus of this isotope?Number of Protons =Number of Neutrons =

200分求一道物理题 求懂英文的高手啊Strontium-89 is a radioactive isotope with an atomic number of 38.How many protons and how many neutrons are present in the nucleus of this isotope?Number of Protons =Number of Neutrons =
200分求一道物理题 求懂英文的高手啊
Strontium-89 is a radioactive isotope with an atomic number of 38.
How many protons and how many neutrons are present in the nucleus of this isotope?
Number of Protons =
Number of Neutrons =

200分求一道物理题 求懂英文的高手啊Strontium-89 is a radioactive isotope with an atomic number of 38.How many protons and how many neutrons are present in the nucleus of this isotope?Number of Protons =Number of Neutrons =
题目的意思是
锶-89是放射性同位素与原子序数为38.
在这种同位素原子核中存在多少个质子和多少中子?
质子数=
中子数=
答案是 38 51

(a) the distance=Ltanθ=Lθ=Lλ/a=1400*544.6×10^(-6)/0.4mm=1.9mm (b) the wideth=2Ltanθ=3.8mm 题目的大意是：一列波长为544.

Number of Protons = 38
Number of Neutrons =51

200分求一道物理题,求懂英文的高手来帮下忙A certain isotope has 80 protons and 122 neutrons in its nucleus.Identify the element involved and find the atomic and mass numbers.Atomic number=Mass number= 问一道物理题,求高手 一道科学物理题'求高手求过程'求答案'答得好的'追加分 200分求一道物理题 求懂英文的高手啊Strontium-89 is a radioactive isotope with an atomic number of 38.How many protons and how many neutrons are present in the nucleus of this isotope?Number of Protons =Number of Neutrons = 200分求一道物理题,求帮助 各种求 懂英文的高手嘞Light with a wavelength of 544.6 nm strikes a single slit that is 0.4 mm wide. The diffraction pattern produced by the slit is observed on a wall a distance of 1.4 m from the slit. (a) 200分求一道物理题 求懂英文高手解答Suppose that we have 39936 atoms of a radioactive substance with a half-life of 3 hours. a. How many atoms of that element remain after 15 hours?Answer= 多少atomsb. How many atoms remain after 21 求高手解答一道物理题要有公式和必要文字说明 2011福建理综一道物理题求高手帮忙解决第二问的t用动量定理怎么解啊? 求高手算一道 所得税 （英文） 求一道物理题 一道物理题,求思路 求问一道物理题 一道物理题,求思路 求一道物理题详解? 求解决一道物理题 求一道物理题、、、、初三 一道物理题,求理由! 一道物理题,求原因!