Physics

• What is the definition of simple harmonic motion (SHM)?


  SHM is a type of periodic motion where the restoring force is directly proportional to the displacement from the equilibrium position and acts in the opposite direction.
• What is the definition of radioactivity?

  Radioactivity is the spontaneous emission of unstable atomic nuclei.
• What are the three main types of radioactive decay?

  The three main types of radioactive decay are alpha decay, beta decay, and gamma decay.
• What is half-life?

  Half-life is the time taken for half of the original number of radioactive nuclei to decay.
• What is a decay constant?

  The decay constant is the probability of a nucleus decaying per unit time.
• How is the decay constant related to half-life?

  The decay constant is related to half-life by the equation: $\lambda =$$\frac{\ln(2)}{T_{1/2}}$.
• Why is increasing distance from a radioactive source effective for safety?

  Increasing distance reduces exposure to radiation, as intensity decreases with distance.
• What is the definition of capacitance?


  Capacitance is a measure of a capacitor's ability to store electric charge.
• What is the formula for capacitance?


  The formula for capacitance is $C =$$\frac{Q}{V}$.
• What is the SI unit of capacitance?


  Capacitance is measured in farads (F).
• What happens to the current flow during the charging process of a capacitor?


  The current flow decreases exponentially over time.
• How does the voltage across a capacitor change during the charging process?


  The voltage across the capacitor increases exponentially.
• What happens to the voltage across a capacitor during the discharging process?


  The voltage across the capacitor decreases exponentially.
• How long is a capacitor considered practically discharged?


  After about 5 time constants.