Physics Group B Questions

Defining a Basic Physical Quantity

• A basic physical quantity is a fundamental quantity that cannot be defined in terms of other physical quantities.
• It is defined by a standard and a unit of measurement.
• Examples of basic physical quantities include length, mass, time, temperature, and electric current.

Limitations of Dimensional Formulas

• Dimensional formulas cannot be used to determine the numerical value of a physical quantity.
• They cannot provide information about the constants of proportionality in physical equations.
• Dimensional formulas cannot be used to analyze situations where there are multiple physical processes involved.

Identifying Mechanical Waves

• A mechanical wave is a disturbance that propagates through a medium, transferring energy without transferring matter.
• Examples of mechanical waves include sound waves, water waves, and seismic waves.
• These waves require a medium to travel and propagate.

Describing Non-Mechanical Waves

• Non-mechanical waves are disturbances that do not require a medium to travel and can propagate through a vacuum.
• They transfer energy without transferring matter.
• Examples of non-mechanical waves include electromagnetic waves (like light and radio waves) and gravitational waves.

Distinguishing Mechanical and Non-Mechanical Waves

• The primary difference between mechanical and non-mechanical waves is their requirement for a medium.
• Mechanical waves necessitate a medium for propagation, while non-mechanical waves can travel through a vacuum.
• Mechanical waves transfer energy through the vibration of particles in the medium, while non-mechanical waves transfer energy through fluctuating electric and magnetic fields.