Question

Problem: 1. Consider a 2 M⊙ neutron star. The mass of a neutron is 1.67 × 10−24 g,
and 1 M⊙ = 2 × 1033 g.
(i) How many neutrons are in this neutron star? (1 point)

A. 6.0 × 1023 neutrons
B. 1.2 × 1023 neutrons
C. 1.2 × 1057 neutrons
D. 2.4 × 1057 neutrons
E. 6.7 × 109 neutrons

Answer 1

Answer on question #54928, Physics / Astronomy — Astrophysics

Question Problem: 1. Consider a 2 M neutron star. The mass of a neutron is $1.67\times 10^{24}$ g, and 1 M = 2 $10^{33}$ g.(i) How many neutrons are in this neutron star? (1 point)

A. $6.0\times 10^{2}3$ neutrons

B. $1.2\times 10^{2}3$ neutrons

C. $1.2\times 10^{5}7$ neutrons

D. $2.4\times 10^{5}7$ neutrons

E. $6.7\times 10^{9}$ neutrons

Solution Number of neutrons is

$N=\frac{M_{star}}{m_{neutron}}=\frac{2\cdot 2\cdot 10^{33}}{1.67\cdot 10^{-24}}\approx 2.4\times 10^{57}$

Answer is D.

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