It's Radioactive!

Antoine Henri Becquerel discovered radioactivity when he was studying

• gamma radiation.
• Geiger counters
• Half-life
• Phosphorescence

The commonality between Becquerel and the Curies is their work with:

• radium
• polonium
• cesium
• uranium

The Curies took pure uranium and a uranium-containing substance. When they measured the amount of radioactivity, there was more in the uranium-containing substance than the pure uranium. Which idea did the Curies most likely develop?

• The date of the material varied between the pure substance and mixed substance.
• The half-life of uranium in a mixed substance is less than pure uranium.
• Radioactivity is magnified by mixed substances.
• There are more radioactive substances than uranium.

Which describes the experiments of Becquerel and the Curies?

• Becquerel coined the term “radioactivity,” and the Curies showed that uranium requires x-rays to form radiation.
• Becquerel showed that uranium gave off radioactivity, and the Curies discovered other radioactive elements.
• Becquerel discovered other radioactive elements, and the Curies showed that uranium gave off radioactivity.
• Becquerel showed that uranium requires x-rays to form radiation, and the Curies coined the term “radioactivity.”

Which best describes the results of Becquerel’s experiments?

• When placed in sunlight, the uranium did not form an image and when placed in darkness, the uranium did form an image.
• When placed in sunlight, the uranium did form an image and when placed in darkness, the uranium did not form an image.
• Both formed images when placed in their respective places.
• Neither formed images when placed in their respective places.

Which best describes a radioactive isotope?

• There are many isotopes.
• There is only one other isotope.
• An atom is stable.
• An atom is unstable.

Tags

NGSS.HS-PS1-8