This magnetic field is one million times strongerthan what we used for the electron gun. Click above the hundreds placethree times to set the Magnetic Field to 300 mT(millitesla). Change the unit for the Magnetic Field from ?T to mTby clicking once above the unit. Click on the front of the alpha source to openthe shutter.Ĩ. Clickon the green Return to Lab arrow to return to the lab.Drag the alpha source from the Stockroom counter and placeit on the table where the electron gun was originally placed (themiddle spot light). Double-click on the alpha sourceto select it and move it to the Stockroom counter. Double-click the electrongun to move it back to the shelf. Enter the Stockroom byclicking inside the Stockroom. Double-click or click and drag the electron gun to move it tothe Stockroom counter. Zero out the Magnetic Field and ElectricField meters by clicking on the appropriate digit buttonsuntil the spot on the phosphor screen is centered again.ħ. What happens to the spot from the electron gun on thephosphor screen? The dot moves to theleftĦ. Click a second timeĪbove the tens place on the Electric Field. Click once above the tens place on the ElectricField meter. What happens to the spot from the electron gun on thephosphor screen? the dot moves to therightĥ. Click it to place it where it wasoriginally and then click above the tens If youmistakenly click between digits, it will (Click the button above the tens place three times. Push the Gridbutton on the phosphor screen, and set the Magnetic Fieldto 30 Drag the lab window down and left and the phosphor screenwindow up and right in order to The phosphor screen detects charged particles (such aselectrons) and it glows momentarily at the positions where theparticles impact the screen.Ĥ. What do you observe? A dot in the center of thescreen What detector is used in this experiment? A phosporScreenģ. What type of charge do electrons have? Negative
What source is used in this experiment? Drag yourcursor over the source to identify it.
The lab will open inthe Quantum laboratory.Ģ. Start Virtual ChemLab and select Alpha and BetaParticles from the list of assignments. Ernest Rutherford used alpha particles in his Gold FoilExperiment.ġ. Helium nucleus, or a helium atom without its two electrons.Consequently, an alpha particle is positivelyĬharged. Another particle ejected during nuclear decay is thealpha particle.
Robert Millikan usedbeta particles in his famous Oil DropĮxperiment. Particles in the context of nuclear decay. They called these particleselectrons, but they are also known as beta Ibolded the questions that I could not finish.ġ-4: Investigating the Properties of Alpha and BetaParticlesĪs scientists began investigating the properties of atoms, theirfirst discovery was that they could extract Please help me finish lab.my lab stopped working and I can'tget the labs to finish.