Lab Record Essentials for Physics Experiments

A minimal lab record must include a labeled circuit diagram, specific procedures and measurements, and commentary on inaccuracies.

Sketching waveforms directly prevents the introduction of new errors and ensures that the data is recorded as accurately as possible.

If data is unexpectedly large or small, it should be noted in the lab notebook as part of the recorded data.

<p>The precision of readings should be explicitly noted along with the measured data.</p> Signup and view all the answers

<p>Including predictions helps to establish a baseline expectation for the outcomes, aiding in the interpretation of results.</p> Signup and view all the answers

<p>Raw data should be recorded immediately and interpreted later, while ensuring that any adjustments or measurements are accurately documented.</p> Signup and view all the answers

<p>The labeled circuit diagram serves as a visual reference for the experimental setup and the components used.</p> Signup and view all the answers

<p>Grounding prevents accidental electrical shocks by providing a safe path for electricity.</p> Signup and view all the answers

<p>Completely disconnect the equipment from the power source before starting maintenance.</p> Signup and view all the answers

<p>Inform the Lab Assistant and Lab Engineer immediately for repairs.</p> Signup and view all the answers

<p>Using dry hands and tools reduces the risk of electrical shock.</p> Signup and view all the answers

<p>Pulling on the plug prevents damage to the cord's insulation.</p> Signup and view all the answers

<p>Use extension cords temporarily and ensure they are properly rated and grounded.</p> Signup and view all the answers

<p>Never remove the grounding post to use a 2 prong outlet or cord.</p> Signup and view all the answers

<p>Always carry portable equipment by the handle or base, not by the cord.</p> Signup and view all the answers

<p>Re-route cords away from floors, rugs, and doorways to prevent tripping and damage.</p> Signup and view all the answers

<p>The angle of deflection increases with electric field intensity.</p> Signup and view all the answers

<p>As beam velocity increases, the angle of deflection decreases.</p> Signup and view all the answers

<p>Do not allow the electron beam to strike any single point of the tube's glass envelope for extended periods.</p> Signup and view all the answers

<p>Warming up the tube helps ensure stable operation and prevents damage.</p> Signup and view all the answers

<p>Store the tube separately in its original packing box, away from moisture and impacts.</p> Signup and view all the answers

<p>20%</p> Signup and view all the answers

<p>0V to the maximum rated voltage (e.g., 30V).</p> Signup and view all the answers

<p>Typically 3A or 5A, depending on the power supply specifications.</p> Signup and view all the answers

<p>To prevent excessive current that could damage components.</p> Signup and view all the answers

<p>CC indicates Constant Current, and CV indicates Constant Voltage.</p> Signup and view all the answers

<p>Gold represents ±5% tolerance and silver represents ±10% tolerance.</p> Signup and view all the answers

<p>4 color: first two colors are significant figures, third is multiplier, fourth is tolerance. Example: Red-Red-Brown-Gold (22Ω ±5%).</p> Signup and view all the answers

<p>22Ω.</p> Signup and view all the answers

<p>Investigate potential faults in the supply or equipment.</p> Signup and view all the answers

<p>Heat can lead to component failure and reduced lifespan.</p> Signup and view all the answers

<p>Equation 9 relates the charge-to-mass ratio of the electron to measurable quantities such as voltage, coil radius, current, and electron path radius.</p> Signup and view all the answers

<p>The average value is obtained by substituting measured values of voltage, current, and radius into equation 9 for multiple conditions and then averaging the results.</p> Signup and view all the answers

<p>Rotating the tube imparts a component of velocity parallel to the magnetic flux, causing the beam to follow a helical path while the perpendicular component is deflected.</p> Signup and view all the answers

<p>The static deflection plates are used to deflect the electron beam in an electric field, enabling the study of electron motion under different forces.</p> Signup and view all the answers

<p>The mass of a single electron can be determined by dividing its known charge by the experimentally calculated charge-to-mass ratio.</p> Signup and view all the answers

<p>Measuring the radius is crucial because it is directly related to the force exerted by the magnetic field on the electron beam, impacting the determination of the charge-to-mass ratio.</p> Signup and view all the answers

<p>The two main components are the magnetic field, which causes circular deflection, and the electric field, which leads to straight-line deflection in a different manner.</p> Signup and view all the answers

<p>The measured current is essential because it influences the magnetic field strength, which affects the electron beam's behavior and the calculated charge-to-mass ratio.</p> Signup and view all the answers

<p>A helical path refers to the spiral trajectory of the electron beam, which is a result of the superposition of circular motion due to the magnetic field and linear motion along the axis of the tube.</p> Signup and view all the answers