The mass of an electron is approximately 9 × 10-28 grams, while the mass of a neutron is approximately 2 × 10-24 grams. Which of the following is true?
A- The mass of a neutron is approximately 20,000 times the mass of an electron.
b- The mass of a neutron is approximately 1,000 times the mass of an electron.
c- The mass of a neutron is approximately 10,000 times the mass of an electron.
d- The mass of a neutron is approximately 2,000 times the mass of an electron.
+33616 mass of neutron/mass of electron = 2*10-24/(9*10-28)
$${\frac{{\mathtt{2}}{\mathtt{\,\times\,}}{{\mathtt{10}}}^{\left(-{\mathtt{24}}\right)}}{\left({\mathtt{9}}{\mathtt{\,\times\,}}{{\mathtt{10}}}^{\left(-{\mathtt{28}}\right)}\right)}} = {\mathtt{2\,222.222\: \!222\: \!222\: \!222\: \!222\: \!2}}$$
so d is closest.
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+33616 mass of neutron/mass of electron = 2*10-24/(9*10-28)
$${\frac{{\mathtt{2}}{\mathtt{\,\times\,}}{{\mathtt{10}}}^{\left(-{\mathtt{24}}\right)}}{\left({\mathtt{9}}{\mathtt{\,\times\,}}{{\mathtt{10}}}^{\left(-{\mathtt{28}}\right)}\right)}} = {\mathtt{2\,222.222\: \!222\: \!222\: \!222\: \!222\: \!2}}$$
so d is closest.
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