WorksheetsWG 3-1 Part 1 Discovery of Radiation
Total questions: 14
Worksheet time: 28mins
Uranium was first discovered when people were mining ___.
gold
silver
copper
lead
The rock containing uranium was called:
pitchrock
pitchblende
uraniumblende
radiorock
Henri Becquerel wrapped ___ in dark paper and putting a chunk of rock containing uranium on top of it.
photographic film
a digital camera
a thin piece of silver
a window
Henri Becquerel then placed everything in sunlight. After unwrapping it, he noticed that the photographic film was "exposed". It was as if sunlight shined directly on it. This was ___ since the photographic film was COVERED with dark paper.
impossible
a reasonable explanation
So Becquerel concluded that ____ must be absorbing the sunlight and transferring this energy to the photographic film through the paper!
the paper
the rock containing uranium
To test this, Becquerel wrapped a new piece of film in paper and put the uranium containing rock on top once again. He was going to put it on the window ledge but noticed that it was…
cloudy out, so he left it on the ledge anyway
cloudy out, so he put it in a dark drawer
sunny out, so he put it on the ledge in the sunlight
Becquerel took the film wrapped in paper with the rock on top out of the drawer, unwrapped it, and noticed that it had been exposed once again, despite being in a dark drawer! He realized the energy required to expose the film:
definitely came from sunlight and had nothing to do with the rock
came from the rock itself and had nothing to do with sunlight
Becquerel's FINAL conclusion was that:
the rock released its own energy that exposed the film, even when it was in the dark
the rock absorbed the sun's energy and then transferred it to the photographic film days later
the rock had nothing to do with the change on the photographic film
Years later, scientists finally understood what caused the rock containing uranium to expose the film. They realized that it contained unstable atoms of ____.
Uranium-238
Thorium-234
Helium-4
Lead-207
The nucleus of these U-238 atoms were ____ and underwent radioactive decay.
stable
unstable
These unstable atoms of Uranium-238 can be represented with the following analogy:
These unstable atoms of Uranium-238 underwent radioactive decay and changed into a more stable atom which can be represented by:
The U-238 atoms changed into ___ during the decay process.
more stable atoms of Thorium
more stable atoms of Uranium
more UNstable atoms of Thorium
As the unstable atoms of Uranium-238 decayed, they released radiation which can be represented by:
