19 When alpha particles are incident on a thin metal foil, most of them pass through undeviated. What does this observation reveal about the nature of the atom?
A
The atom has a dense nucleus.
B
The atom is mostly empty space.
С
The atom is very small.
The nucleus of the atom is positively charged.
D

In which situation has the independent variable for the experiment been changed? check all that apply. changed from counting the number of duckweed at day 0 and day 14 to counting them every day changed from testing duckweed growth in beakers to testing duckweed growth in large outdoor tanks changed from testing the effect of ph on duckweed growth to testing the effect of light levels on duckweed growth changed from testing the effect of acid ph on duckweed growth to testing the effect of basic ph on duckweed growth

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

Astone weighing 1.5 kilograms is resting on a rock at a height of 20 meters above the ground. the stone rolls down 10 meters and comes to rest on a patch of moss. the gravitational potential energy of the stone on the moss is joules.