C: gamma only
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Tritium is a radioactive isotope of hydrogen with a half-life of 12 years. If a sample starts with 40 million atoms o…
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 speed of radio waves is c. A radio station transmits waves with a wavelength λ. What is the frequency of the tran…
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…