Explanation

The repulsive energy between particles is always positive.

Explanation

When a dielectric sheet is placed between two charges, the electrostatic force between them will "decrease" because the presence of the dielectric reduces the electric field strength between the charges, thus decreasing the force experienced by them.

Explanation

To find the tension in the wire, we can use the formula:

T = μv^2

where T is the tension, μ is the linear density, and v is the wave speed.

First, we need to find the wave speed. We can do this by analyzing the wave equation:

Y = 0.021 sin (x + 30t)

The wave speed is given by the coefficient of t, which is 30 m/s.

Now we can plug in the values:

T = μv^2

= (1.3 x 10^-4 kg/m) x (30 m/s)^2

= 0.12 N

So the tension in the wire is 0.12 N.

Explanation

Explanation

• A four-level laser is a type of laser that has four energy levels involved in the lasing process.
• The He-Ne laser (Helium-Neon laser) is a common example of a four-level laser.
• It works by exciting helium atoms, which then transfer their energy to neon atoms, causing them to emit laser light.

Explanation

"If you had followed the rules, you would not have been disqualified."

Explanation

Einstein’s photoelectric equation is "hv = hvo + (1/2 mv^2) max", where:

• hv is the energy of the incident photon
• h is Planck's constant
• vo is the threshold frequency
• m is the mass of the emitted photoelectron
• max is the maximum kinetic energy of the emitted photoelectron.

Explanation

The property that doesn't typically apply to solids is "Solids have an indefinite volume."

Explanation

In a fusion reactor, it is necessary to overcome the electrostatic repulsive force between nuclides (nuclei) in order to achieve fusion. This requires:

• Very high temperature: Fusion reactions occur at extremely high temperatures, typically around 150 million degrees Celsius (270 million degrees Fahrenheit). This energy is needed to overcome the electrostatic repulsive force and bring the nuclei close enough together to fuse.
• Very high pressure: Fusion reactions also require incredibly high pressure, similar to those found at the core of the sun. This pressure helps to overcome the repulsive force and increase the likelihood of fusion.
• Very small volume: The reaction chamber in a fusion reactor is designed to be extremely small, which helps to increase the density of the plasma (ionized gas) and reduce the distance between the nuclei. This makes it easier to overcome the electrostatic repulsive force and achieve fusion.

Explanation

The net electric field is zero inside any conductor with a static charge.