Which subatomic particle is smaller: neutron or proton?

The least penetrating form of radiation is

Ahot-air balloon takes off from the ground traveling vertically with a constant upward acceleration of magnitude g/4. after time interval δt, a crew member releases a ballast sandbag from the basket attached to the balloon. how many seconds does it take the sandbag to reach the ground? (express your answer in terms of δt)

According to the image below, which season is about to begin in the southern hemisphere? a. summer b. autumn c. winter d. spring