Question

Galileo was the first scientist to do which of the following?

Answer 1

Define and measure the speed
choose this



heliocentric theory = Ptolomeu
radioactivity = Becquerel
reflecting telescope - Newton (not sure)

Answer 2

Answer

Correct answer is define and measure the speed

Explanation

Galileo was the first scientist who define speed and give the formula of speed as distance over time

discover radioactivity

This option is also not correct because Radioactivity was discovered by Henri Becquerel in 1852.

invent the reflecting telescope

this option is not correct because reflecting telescope  was discovered by Sir Isaac Newton in 1668

propose the heliocentric theory:

This option is also not correct because Nicolaus Copernicus proposed the

heliocentric theory in 1543