Calculate electrons using current, charge, and electron charge

Steps:

• Current I = V / R = 9 V / 5.6 × 10³ Ω = 1.607 × 10^{-3} A
• Charge Q = I × t = 1.607 × 10^{-3} A × 60 s = 9.64 × 10^{-2} C
• Number of electrons N = Q / e = 9.64 × 10^{-2} / 1.6 × 10^{-19} C = 6.0 × 10^{17}

Why C is correct:

• Matches N from Q = It and N = Q/e, where e = 1.6 × 10^{-19} C is the elementary charge.

Why the others are wrong:

• A: Overestimates by factor of 10, likely from using t = 600 s instead of 60 s.
• B: Overestimates by factor of ~100, possibly from ignoring kΩ and taking R = 5.6 Ω.
• D: Underestimates by factor of 6, perhaps from using e = 1 × 10^{-18} C.

Final answer: C