1) A person stands at a point 200 m in front of the face of a sheer cliff. If the person shouts how much time will elapse before an echo is heard?

temp (air) = 10 deg, Celsius

-1.10 s

-3.48 s

-0.58 s

-0.85 s

-1.18 s

2) How much energy is required to vaporize 1 gram of ice at zero deg Celsius?

- 1 kcal

- 820 cal

- 720 cal

- 620 cal