A carnot engine works as a refrigrator between 250K and 350K.If it receives 750 cal of heat from the reserviour at lower temperature .Calculate the amount of heat rejected at higher tempertaure.

Explanation

To solve the problem step by step, we will use the formula for a Carnot refrigerator, which relates the heat absorbed from the cold reservoir (Q2) and the heat rejected to the hot reservoir (Q1) with the temperatures of the reservoirs.

### Step-by-Step Solution:

1. **Identify the Given Values:**
- Lower temperature (T2) = 250 K
- Higher temperature (T1) = 350 K
- Heat received from the lower temperature reservoir (Q2) = 750 cal
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