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# 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 followi

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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.

Jan 4, 2015

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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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Jan 5, 2015

#1
+5

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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Alan Jan 5, 2015