`14 g` of a radioactive substance decays to `7 g` in 20 min. Will the time required be more or less the following processes:
i. `20 g` decreases by `8 g`
ii. `20 g` decreases to `8 g`. Explain

Explanation

To solve the problem, we need to analyze the decay of a radioactive substance based on the information given. We know that 14 g of a radioactive substance decays to 7 g in 20 minutes, indicating that the half-life of the substance is 20 minutes. We will use this information to determine the time required for the two processes described in the question.

### Step-by-step Solution:

1. **Determine the Half-Life**:
- From the problem, we know that the half-life (t_half) of the substance is 20 minutes, as 14 g decays to 7 g in this time.

2. **Calculate the Rate Constant (k)**:
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