Which scientific phenomenon, discovered in the late 19th century, demonstrated that atoms are NOT indivisible?
ARadioactivity
BMagnetism
CThermal expansion
DDiffusion
Answer & Solution
Correct answer: A. Radioactivity
Radioactivity — the emission of invisible energy and particles from certain elements — showed atoms must be composed of smaller subatomic particles, contradicting Dalton's indivisibility claim.
Related questions
Chandrayaan-3 (India's lunar mission) achieved a historic FIRST in 2023 by:The double-helix structure of DNA was discovered by:The 'powerhouse of the cell' that produces ATP for energy is:At room temperature, the only metal that exists in the LIQUID state is:The pH of a NEUTRAL solution (pure water at 25°C) is:In the modern periodic table, elements are arranged by:Standard Indian household electricity supply is:The refractive index of a medium is defined as: