Radioactive substance of 1 curie is the amount that can produce `……………………………` disintegrations per second.

Answer

To solve the question, we need to determine the number of disintegrations per second that corresponds to 1 curie of a radioactive substance.

### Step-by-Step Solution:

1. **Understand the Definition of Curie**:
The unit "Curie" (symbol: Ci) is a measure of radioactivity. It is defined based on the number of disintegrations that occur in a radioactive substance.

2. **Know the Value of 1 Curie**:
According to the definition, 1 curie is equivalent to the amount of a radioactive substance that produces a specific number of disintegrations per second.

3. **Identify the Number of Disintegrations**:
The standard value for 1 curie is given as:
\[ 1 \text{ Curie} = 3.7 \times 10^{10} \text{ disintegrations per second} \]

4. **Fill in the Blank**:
Therefore, the answer to the question is:
\[ \text{Radioactive substance of 1 curie is the amount that can produce } 3.7 \times 10^{10} \text{ disintegrations per second.} \]

### Final Answer:
Radioactive substance of 1 curie is the amount that can produce **3.7 x 10^10 disintegrations per second**.

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