Question

becquerel is a \(\ldots \ldots \ldots \ldots \ldots .\) unit and its symbol is \(\ldots \ldots \ldots \ldots \ldots\) (a) supplementary, Bq (b) fundamental, Bq (c) derived, Bq (d) derived, Bv

Short answer

The Becquerel unit is a \(derived\) unit and its symbol is \(Bq\).

Step-by-step solution

Option (a) Supplementary, Bq

Supplementary units are typically required to define additional dimensions, such as angles, on top of the basic units like length, mass, and time. Becquerel is a unit of radioactivity, measuring the activity of a radioactive source, so it doesn't fit in the supplementary unit category.

Option (b) Fundamental, Bq

Fundamental units are the essential building blocks for all other units and dimensions in physics. These fundamental quantities include time, length, mass, etc. The Becquerel is not one of these fundamental quantities, as it can be represented by the dimensions of other fundamental units.

Option (c) Derived, Bq

Derived units come from combinations of fundamental units and can be used to appropriately describe quantities that are not covered by fundamental units. Becquerel measures radioactivity in terms of disintegrations per second, which can be expressed in terms of the fundamental units. With the symbol matching as Bq, this seems like a promising option.

Option (d) Derived, Bv

The only difference from option (c) is the symbol provided. However, the symbol given is incorrect. The symbol for Becquerel is Bq, not Bv. #Conclusion#: After analyzing the options, the Becquerel unit is a \(derived\) unit and its symbol is \(Bq\). Thus, the correct answer is: (c) derived, Bq.

Key concepts

Radioactivity Measurement

Radioactivity is a fascinating concept in physics that deals with the behavior of unstable atomic nuclei. A radioactive substance emits particles or energy as it decays. To quantify this decay, we use specific units.
The Becquerel (Bq) is the standard unit for measuring the activity of a radioactive sample. Named after physicist Henri Becquerel, this unit measures the rate at which a source of radioactivity undergoes decay, denoting the number of disintegrations per second.
Understanding this concept helps us grasp how scientists evaluate different radioactive materials and their level of radiation.

• Becquerel (Bq): Measures disintegrations per second.
• Evaluates the rate of decay in radioactive materials.
• Enables precise scientific analysis of radioactive sources.

Physics Units

Physics uses a set of units to quantify and describe physical phenomena. These units help both scientists and students understand and communicate complex concepts. In physics, units fall into different categories based on how they represent physical quantities.
Fundamental units are the most basic units in physics from which other units are derived. Examples include the meter for length, the kilogram for mass, and the second for time.
These fundamental units create the foundation for studying everything in physics, from the smallest particles to the grandest galaxies.

• Fundamental Units: Basic building blocks of physics units.
• Examples: Meter (m), Kilogram (kg), Second (s).

Derived Units

Derived units arise from combinations of fundamental units, expanding the scope of what can be measured in physics. They allow us to express quantities that are not directly measured using fundamental units alone.
The Becquerel is an example of a derived unit in the context of radioactivity. It combines the fundamental definition of time (seconds) with the concept of radioactive decays. Unlike supplementary units, which add dimensions like angles, derived units help describe complex quantities efficiently.

• Derived Units: Combinations of fundamental units.
• Examples: Becquerel (Bq) for radioactivity, Newton (N) for force.
• Crucial for expressing a wide range of physical phenomena.