The electric field induces the flow of electrons, known as __________________, a.voltage
b.electric current
c.resistance
d.interference

On a seismogram, the first recorded waves are the P type, followed by the S type and, finally, the surface waves. Option A) A and B travel through Earth's interior.

Note: the question was answered according to the attached image. Look at the seismogram and the explanation, and if your image differs from this one, apply the same reasoning to answer the question.

What are the Seismic waves?

When rocks break during plate movements, they generate waves that propagate, moving inside the Earth and on its surface. These are the seismic waves.

What are the Types of seismic waves?

There are three types of waves,

• P waves ⇒ consist of the transmission of the rock's compressions and rarefactions. These waves can be transmitted in the interior of the Earth.

P waves are the fastest in moving and can be transmitted through different materials, liquid or solid.

• S waves ⇒ they move in a perpendicular direction to the disturbance propagation direction. These waves can also be transmitted in the interior of the Earth.

S wavesare slower and can not be transmitted through liquid masses.

• Surface waves  ⇒ They can only propagate through the most superficial layers of the Earth. Their amplitude decrease with depth.

Surface waves are the slowest ones.

Due to the difference in the speed, the first recorded waves on a seismograph during an earthquake are the P waves, followed by the S waves, and finally, the surface waves.

The difference in waves' speed is used to determine the location of the earthquake focus and the structures of Earth.

As waves move through different materials, they change their speed. This change leads scientists to know what type of masses they are going through.

Following the waves from earthquake focus and recording their travel speed is helpful to determine the structures of Earth's interior.

The provided seismogram shows,

A- P waves ⇒ Transmitted in the interior of the Earth ⇒ first ones to be recorded. They are absorbed by liquid and solid medium.

B- S waves ⇒ Transmitted in the interior of the Earth ⇒ second ones to be recorded. They are absorbed by solid medium.

C- Surface waves ⇒ Transmitted in the syperficial layers of the Earth ⇒ last ones to be recorded. They are the slowest ones.

According to this information, we can assume that the correct option is a. Wave A and Wave B travel through Earth's interior.

You can learn more about earthquake waves at

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Answer:

To hit someone on the head

Explanation:

self protection

The nucleus of an atom is positively charged and the electrons are negatively charged therefore, the nucleus of an atom attracts the electrons around it and this nature is called nuclear charge.

What is the nuclear charge?

Each electron in an atom experiences two kinds of force one is an attraction to the nucleus and another is repulsion from other electrons. The presence of many electrons makes more repulsive force and this decreases the nuclear attraction.

The amount of nuclear charge is the positive charge experienced by an electron that is present in a multi-electron atom. The attractive interaction between the nucleus of an atom and electrons of the same atom increases with the increase of positive charge (+Ze) on the nucleus.

This attraction for the valence electrons will be lower because of the  Shielding of inner shell electrons. Due to the shielding of inner-shell electrons, the valence electrons will not experience the positive charge of the nucleus entirely while electrons close to the nucleus feel maximum attraction and have the lowest energy.

Learn more about nuclear charge, here:

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Explanation:

First, calculate the moles of using ideal gas equation as follows.

                PV = nRT

or,          n =

                =      (as 1 bar = 1 atm (approx))

                = 0.183 mol

As,   Density =

Hence, mass of water will be as follows.

                Density =

             0.998 g/ml =    

                 mass = 3.25 g

Similarly, calculate the moles of water as follows.

        No. of moles =

                              =              

                              = 0.180 mol

Moles of hydrogen = = 0.36 mol

Now, mass of carbon will be as follows.

       No. of moles =

          0.183 mol =              

                              = 2.19 g

Therefore, mass of oxygen will be as follows.

              Mass of O = mass of sample - (mass of C + mass of H)

                                = 3.50 g - (2.19 g + 0.36 g)

                                = 0.95 g

Therefore, moles of oxygen will be as follows.

          No. of moles =

                               =              

                              = 0.059 mol

Now, diving number of moles of each element of the compound by smallest no. of moles as follows.

                         C              H           O

No. of moles:  0.183        0.36       0.059

On dividing:      3.1           6.1            1

Therefore, empirical formula of the given compound is .

Thus, we can conclude that empirical formula of the given compound is .