The resistance of `Nb_(3)`Ge becomes almost zero at:

Options

A. 23 K
B. 30K
C. 40K
D. 25K

Answer

To solve the question regarding the resistance of Nb₃Ge, we need to follow these steps:

### Step 1: Understand the Concept of Critical Temperature
The critical temperature (T_c) is the temperature below which a material exhibits superconductivity, meaning its electrical resistance drops to zero. For Nb₃Ge, the critical temperature is given as 23.20 Kelvin.

**Hint:** Remember that superconductivity occurs below a specific temperature known as the critical temperature.

### Step 2: Analyze the Given Information
We are tasked with determining the temperature at which the resistance of Nb₃Ge becomes almost zero. According to the information provided, if the temperature is less than the critical temperature (23.20 K), the resistance will approach zero.

**Hint:** Compare the given temperature options with the critical temperature to find the suitable one.

### Step 3: Evaluate the Temperature Options
We need to find a temperature that is less than the critical temperature of 23.20 K. The only option provided in the context is 23 K.

**Hint:** Look for temperatures that are numerically lower than 23.20 K.

### Step 4: Conclusion
Since 23 K is less than 23.20 K, we can conclude that at 23 K, the resistance of Nb₃Ge will be almost zero.

**Hint:** Confirm that the selected temperature meets the condition of being less than the critical temperature for superconductivity.

### Final Answer
The resistance of Nb₃Ge becomes almost zero at 23 K.