3<\/sup>He v\u00e0 c\u00f3 s\u1ed1 n\u01a1tron b\u1eb1ng s\u1ed1 proton c\u1ee7a h\u1ea1t nh\u00e2n n\u00e0y, l\u00e0 h\u1ea1t nh\u00e2n nguy\u00ean t\u1eed<\/p>\nA. heli \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B. triti<\/p>\n
C. hi\u0111r\u00f4 th\u01b0\u1eddng \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D. \u0111\u01a1teri<\/p>\n
C\u00e2u 10:<\/b>\u00a0C\u00f3 128 n\u01a1tron trong \u0111\u1ed3ng v\u1ecb\u00a0210<\/sup>Pb, h\u1ecfi c\u00f3 bao nhi\u00eau n\u01a1tron trong \u0111\u1ed3ng v\u1ecb\u00a0206<\/sup>Pb<\/p>\nA. 122 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B. 124<\/p>\n
C. 126 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D. 130<\/p>\n
C\u00e2u 11:<\/b>\u00a01 MeV\/c2<\/sup>\u00a0c\u00f3 gi\u00e1 tr\u1ecb b\u1eb1ng<\/p>\nA. 1,78.10-30<\/sup>\u00a0kg \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B. 0,561.1030<\/sup>\u00a0kg<\/p>\nC. 0,561.1030<\/sup>\u00a0J \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D. 1,78.10-30<\/sup>\u00a0kg.m\/s<\/p>\n