B: 10 million
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A radioactive nuclide ²³⁸₉₂U decays into thorium by emitting an alpha-particle. The thorium then decays into protacti…
Chlorine exists as two isotopes. One has a nucleon number (mass number) of 35 and the other has a nucleon number (mas…
The radioactive isotope radium-226 may be shown as ⁸⁸²²⁶Ra. How many protons does an atom of radium contain?
Light is incident on a mirror and is reflected as shown. What is the angle of incidence and the angle of reflection?
Light is incident on one face of a glass block at an angle of incidence of 40°. The glass block is in air. The refrac…
In a short-sighted eye, light from distant objects is not focused on the retina. Where is this light focused and what…