What instrument was key to Van Allen's discovery?
Radioscope
Geiger–Müller tube
Telescope
Microscope
Answer
A Geiger–Müller tube was the instrument that was key to Van Allen's discovery of the Van Allen radiation belts. This instrument is a gas-filled tube that produces an electrical pulse when it is exposed to radiation. Van Allen used a Geiger–Müller tube to measure the radiation levels in space, and he discovered that there were two belts of radiation around the Earth.
Exploring the Outer Limits: The James Van Allen Quiz
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