## What is the unit of radioactive decay energy?

becquerel (Bq)
The SI unit of radioactivity is becquerel (Bq) and this term is named after Henri Becquerel. Unit of radioactivity is defined as: The activity of a quantity of radioactive material where one decay takes place per second.

## What are 3 terms that mean radioactive decay?

A material containing unstable nuclei is considered radioactive. Three of the most common types of decay are alpha decay (α-decay), beta decay (β-decay), and gamma decay (γ-decay), all of which involve emitting one or more particles.

How long does it take the last proton to decay?

Some of the Grand Unified theories (GUTs) predict long-term proton instability between 1032 and 1038 years, with the upper bound on standard (non-supersymmetry) proton decay at 1.4×1036 years and an overall upper limit maximum for any proton decay (including supersymmetry models) at 6×1042 years.

### What is CGS and SI unit of radioactivity?

Ans: Curie is the CGS unit of radioactivity. In 1975, it was replaced by becquerel as S.I unit.

### What are curies a measure of?

One of three units used to measure the intensity of radioactivity in a sample of material. This value refers to the amount of ionizing radiation released when an element (such as uranium) spontaneously emits energy as a result of the radioactive decay (or disintegration) of an unstable atom.

What is Q-value of decay?

The “Q-value” of the decay, Qα is the difference of the mass of the parent and the combined mass of the daughter and the α-particle, multiplied by c2. Qα = (mP − mD − mα)c2. The mass difference between the parent and daughter nucleus can usually be estimated quite well from the Liquid Drop Model.

## What is the unit of rate of decay?

Answer. The answer is B. Becquerel. Becquerel (Bq) is one of three units of measurement used to indicate radioactivity or how many atoms in the material decay or disintegrate in a specific amount of time. A Bq represents the rate of decay equal to one disintegration per second.

## What is the measure of radioactive decay rate?

The rate of decay is often referred to as the activity of the isotope and is often measured in Curies (Ci), one curie = 3.700 x 1010 atoms that decay/second. By knowing the amount of radioisotope and the activity of the sample, the rate constant can be determined.

What is the lifespan of a proton?

Experiments say the proton lifetime has to be greater than about 1034 years: That’s a 1 followed by 34 zeroes. For reference, the universe is only 13.8 billion years old, which is roughly a 1 followed by 10 zeros.

### What is the half-life of a photon?

Photon

Photons are emitted by a cyan laser beam outside, orange laser beam inside calcite and its fluorescence
Composition Elementary particle
Mass 0 (theoretical value) < 1×10−18 eV/c2 (experimental limit)