Radioactivity

Using the radioactive decay formula: Given:

• Initial amount ( ) = 256\,g
• Half-life ( ) = 4\,h
• Elapsed time ( ) = 10\,h

Calculation Steps
1. Compute the exponent: 2. Calculate the decay factor: 3. Determine remaining quantity: Verification
After each 4\,h half-life:

• At 4\,h:
• At 8\,h:
• At 12\,h:

Since 10\,h is 2.5 half-lives, the exact calculation shows: Conclusion
The exact amount remaining after 10\,h is .