Lapse rate in troposphere is

Options

A. `1.6^(@)C` per 100 m elevation
B. `6.5^(@)C` per 100 m elevation
C. `6.5^(@)`C per 1000 m elevation
D. `6.5^(@)`C per 10 m elevation

Answer

**Step-by-Step Solution:**

1. **Understanding Lapse Rate**: The lapse rate refers to the rate at which temperature decreases with an increase in altitude. It is a crucial concept in meteorology and atmospheric science.

2. **Defining the Troposphere**: The troposphere is the lowest layer of Earth's atmosphere, where most weather events occur. It extends from the Earth's surface up to about 8 to 15 kilometers high, depending on the location.

3. **Temperature Variation with Altitude**: As you ascend in the troposphere, the temperature generally decreases. For example, at the Earth's surface, the temperature might be A degrees Celsius, and at a higher altitude, it could be B degrees Celsius, where A is greater than B.

4. **Quantifying the Lapse Rate**: The average lapse rate in the troposphere is approximately 6.5 degrees Celsius per kilometer. This means that for every 1 kilometer increase in altitude, the temperature decreases by about 6.5 degrees Celsius.

5. **Conversion to Meters**: Since 1 kilometer equals 1000 meters, the lapse rate can also be expressed as 6.5 degrees Celsius per 1000 meters of elevation.

6. **Conclusion**: Therefore, the lapse rate in the troposphere is 6.5 degrees Celsius per kilometer or 6.5 degrees Celsius per 1000 meters.

**Final Answer**: The lapse rate in the troposphere is 6.5 degrees Celsius per kilometer (or 6.5 degrees Celsius per 1000 meters).

---