The discoverer of x-rays was(blank) the discoverer of radioactivity was (blank)

The discoverer of X-rays was Wilhelm Conrad Roentgen.

The discoverer of radioactivity was Henri Bacquerel.

Explanation:

Wilhelm Conrad Roentgen discovered X-rays in early 1895. Roentgen observed a fluorescent glow of crystals on a table near his tube when he was working with a cathode-ray tube in his laboratory, The Cathode ray tube consisted of a glass envelope with positive and negative electrodes encapsulated in it. When a high voltage was applied the air in the tube was evacuated and hence the tube produced a fluorescent glow.

Becquerel had discovered radioactivity in 1896. To study the properties of x-rays he was using naturally fluorescent minerals. He exposed potassium uranyl sulfate to sunlight and then on photographic plates wrapped in black paper, he placed this. He believed that suns's energy would be absorbed by uranium which would then produce X rays. Without any Solar energy  uranium emitted radiation because the images produce in this experiment were strong and clear.

first let us lay out the formula for potential

and kinetic energy:

pe = mgh

ke = (mv^2)/2

where: m=mass, v=velocity, g=gravitational

acceleration, h=height

calculating for mass using the known values of

pe:

340j = m (9.81 m/s^2) (50ft) (1m/3.28ft)

m = 2.27 kg

the law of conservation of energy states that

energy is neither created nor destroyed. therefore, the change in kinetic

energy from 50 ft to 35 ft would be equal to the change in potential energy

from 50 ft to 35 ft. however it would be opposite in signs since one is losing

while other is gaining.

ke(35ft) – ke(50ft) = - [ pe(35ft) – pe(50ft]

ke(50ft) = 0 since the brick is initially at rest

ke(35ft) = 340j - 2.27kg (9.81 m/s^2) (35ft)

(1m/3.28 ft)

ke(35ft)

= 102.38 j

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.