If the temperature at place 500m above sea level where the tourist started to climb the mountain was 20°c, what was the temperature when they reached 2000m above sea level?

To determine the temperature at 2000m above sea level, we need to consider the lapse rate. The lapse rate is the rate at which temperature decreases with an increase in altitude. On average, the lapse rate is around 6.5°C per 1000m.

Given that the temperature at 500m above sea level is 20°C, we can calculate the temperature at 2000m above sea level as follows:

Temperature decrease per 1000m = 6.5°C
Altitude difference = 2000m - 500m = 1500m

Temperature decrease at 1500m = (6.5°C/1000m) * 1500m = 9.75°C

Temperature at 2000m above sea level = 20°C - 9.75°C = 10.25°C

Therefore, the temperature when they reached 2000m above sea level would be approximately 10.25°C.