What is radioactive decay Mcq?
Radioactive decay is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive.
What is radioactivity choose the correct answer?
radioactivity, property exhibited by certain types of matter of emitting energy and subatomic particles spontaneously. It is, in essence, an attribute of individual atomic nuclei.
What are examples of radioactive decay?
The atom of the radioactive element gets transformed into a new decay product multiple times. This decay process carries on till the atom manages to find a stable state….Examples of Radioactive Decay
- Smoke Detectors.
- Watches and Clocks.
- Ceramics.
- Glass.
- Fertilizers.
- Gas Lantern Mantles.
- Medicinal Equipment.
Is radioactive decay constant?
Radioactive decay happens when a radioactive substance emits a particle. It’s impossible to predict exactly when a given atom of a substance will emit a particular particle, but the decay rate itself over a long period of time is constant.
Are gamma rays made of photons?
What are gamma rays? A gamma ray (g) is a packet of electromagnetic energy (photon) emitted by the nucleus of some radionuclides following radioactive decay. Gamma photons are the most energetic photons in the electromagnetic spectrum.
How far can radiation travel?
Those up to eight kilometres outside of it could suffer third-degree burns, and those up to 11 kilometres away may experience second- and first-degree burns. Anyone up to 85 kilometres away could experience temporary blindness or severe burns to the retina if looking directly at the blast.
Which type of radiation has no mass?
Gamma radiation
Gamma radiation, unlike alpha or beta, does not consist of any particles, instead consisting of a photon of energy being emitted from an unstable nucleus. Having no mass or charge, gamma radiation can travel much farther through air than alpha or beta, losing (on average) half its energy for every 500 feet.
What are radioactive elements called?
What are the 4 radioactive elements? The common 4 radioactive elements are Uranium, Radium, Polonium, Thorium etc.
Can radioactive decay speed up?
A radioactive element’s rate of decay has been speeded up. Scientists in Japan have persuaded a radioactive material to decay significantly faster than normal.
Which type of radiation is least penetrating?
Alpha
Alpha is the least penetrating, while gamma is the most penetrating. Nonetheless, all three are ionising radiation: they can knock electrons out of atoms and form charged particles.
Is fission radioactive decay?
spontaneous fission, type of radioactive decay in which certain unstable nuclei of heavier elements split into two nearly equal fragments (nuclei of lighter elements) and liberate a large amount of energy.
Can photons be radioactive?
Photons have no charge, no resting mass, and travel at the speed of light. Photons are emitted by the action of charged particles, although they can be emitted by other methods including radioactive decay.
Does radiation pass through water?
Any radioactive material that gets into surface water or ground water sources will be diluted to very low levels by the water and will be safe to use for washing skin, hair, and clothing.
What are the three types of radioactivity produced by radioactive decay?
1. When unstable nuclei undergo radioactive decay, they emit three types of radioactivity. Which is not one of them? Alpha, beta, and gamma radiation are real.
How long does it take a radioactive substance to disintegrate?
The half-life of a radioactive substance is 48 hours. How much time will it take to disintegrate to its 1/16 th part Consider two nuclei of the same radioactive nuclide. One of the nuclei was created in a supernova explosion 5 billion years ago. The other was created in a nuclear reactor 5 minutes ago.
Is radioactivity spontaneous and random?
Radioactivity is spontaneous and random. Radioactivity just happens. The reason any prediction about half-life and radiation dose can be made is because the sample size is sufficiently large. 3. Which type of radioactive decay doesn’t change the atomic number?
What is the activity of radioactive sample with half life of 1 month?
A radioactive sample with a half life of 1 month has the label : “Activity=2 micro curies on 1.8.1991.” What will be its activity two months later? Radioactive nuclei that are injected into a patient collect at certain sites within its body, undergoing radioactive decay and emitting electromagnetic radiation.