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usually dust of some kind, occasionally water vapor, reflecting the laser light. I am assuming, of course, the part of the beam outside the excitation tube.

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16y ago

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What evidence did Thomson have that his glowing beam contained negative particles?

J.J. Thomson discovered that his glowing beam contained negative particles by observing the deflection of the beam in an electric field and measuring the charge-to-mass ratio of the particles. This led to his conclusion that the particles in the beam were negatively charged electrons.


How can one see an invisible laser beam?

One can see an invisible laser beam by using special equipment like a laser beam detector or by observing the beam's reflection off of particles in the air.


How can one see a laser beam?

To see a laser beam, you can use special materials like smoke or fog to make the beam visible. The light from the laser reflects off these particles, allowing you to see the beam.


Why do you see the laser beam from powder?

When a laser beam hits a powder, it scatters the light in all directions due to the irregularities and rough surfaces of the powder particles. This scattering effect causes the laser beam to become visible as it interacts with the particles, making it appear as though the beam is "visible."


How do optical tweezers work?

Optical tweezers use a focused laser beam to trap and manipulate small particles such as cells or nanoparticles. The laser beam generates a gradient force that attracts the particles towards the center of the beam, creating a trap. By moving the laser beam or changing its properties, the particles can be moved, rotated, or studied in a controlled manner.


What evidence did Thomson that his glowing beam contained negative particles?

The cathodic rays beam was deflected by the atomic nucleus.


Why cant you see a laser beam as it crosses the room?

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This would not be possible for a couple of reasons. First let us set up the following scenario. We will shoot a laser from the Earth to the Moon which will take 1.2 seconds to arrive. You will be observing from 240,000 miles away in a spaceship that is at a right angle to the laser beam. This will make the Moon the same apparent size as it is on Earth. In theory, you should see a laser beam begin from Earth and quickly get longer and longer until it reaches the Moon in 1.2 seconds. The problem is that when we see a laser beam, we are not actually seeing the beam itself, only a small part of the beam reflecting off particles in the laser beam's path. Since space is a vacuum, there are no particles for the beam to reflect off, so we see nothing unless the laser beam is pointed directly at us, which in this case is not. The other problem is that when the laser light is reflected toward us from the particles, it is also scattered and would be much too faint to observe from that distance, even with a telescope.


In thompsons experiment why was the glowing beam repelled by a negatively charged plate?

In Thompson's experiment, the glowing beam was repelled by a negatively charged plate because the beam consisted of negatively charged particles known as electrons. Like charges repel each other according to the principles of electrostatics, causing the beam to be deflected away from the negatively charged plate.