A radioactive sample initially contains N atoms. After three half-lives the number of atoms that have disintegrated is
A. N8
B. 3N8
C. 5N8
D. 7N8
Correct Answer: Option A
Explanation
N → N2 → N4 → N8
▶️ Convert to standard form 1️⃣ Write 0. 000546 in standard form. A. 5460000 B. 546.0000 C. 5.460000 X 10⁴ D. 5.46 X 10¯⁴ 2️⃣ Write 18 in standard form . A. 18 X 10¹ B. 1.8 X 10° C. 18.0 X 10² D. 1.8 X 10¹ 3️⃣ Write 8000 in standard form. A. 8 X 10³ B. 0.8 X 10^8 C. 8000.0 X 10³ D. 8.0 X 10^8 4️⃣ Write (12)² in standard form. A. 1.23 X 10³ B. 12.3 X 10² C. 1.44 X 10² D. 4.41 X 10² 5️⃣ Write 00.102 in standard form. A. 0.0102 X 10³ B. 0.102 X 10³ C. 1.2 X 10¯² D. 1.02 X 10¯² 6️⃣ Write 71 + 0.5 + 0.002 in standard form. A. 7.1502 X 10¹ B. 7.152 X 10¯⁴ C. 7.7 X 10¹ D. 7.7 X 10¯⁴ 7️⃣ Solve for x in the expression 70x + 25 =30. Leave your answer in standard form. A. 7.1 × 10¯² B. 7.1 × 10² C. 7.85 × 10² D. 7.85 × 10¯² 8️⃣ What is 6.7 × 10⁴ written as an ordinary number? A. 67104 B. 67000 C. 0.0066 D. 670 9️⃣ What is 3 × 10¯² written as an ordinary number? A. 300 B. 3100 C. 0.031 D. 0.03 1️⃣0️⃣ How is 45,000 written in standard form? A. 45 × 10³...
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