PHYSICS HIGH SCHOOL

Atomic physicists do not know why all of the atomic particles stay together within an atom

Answers

Answer 1
Answer: The statement "Atomic physicists do not know why all of the atomic particles stay together within an atom" is false. In fact, physicists now knows why they are concentrated within an atom. It is because of the opposite charges between the electrons and protons.

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Which one of the following lenses is a converging lens

Answers

Hi There! :)

Which one of the following lenses is a converging lens

Double-convex lens

A wave with a period of 1/3 second has a frequency of

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The frequency of the wave is 3hz

What is the acceleration of a body revolving in a circle at uniform speed? The acceleration is zero. The acceleration is directed tangentially. The acceleration is directed toward the center. The acceleration is directed away from the center.

Answers

A body revolving in circle generally has tangential acceleration if the speed is changing. Since the speed is uniform here, the tangential acceleration is zero.

centripetal acceleration is directed towards the center and is given as

a = v²/r                    where a = centripetal acceleration , v = speed , r = radius

Since both speed and radius are constant here, the centripetal acceleration is constant and is always directed towards the center.

hence the correct choice is

The acceleration is directed toward the center.

What is the equation for calculating the heat energy released during heating effect of electric current?

Answers

The heat energy released from a piece of wire or any other section of a circuit is:

Energy = (voltage between its ends) x (current through it) x (time it's been going)
The equation for calculating the heat energy released by the heating effect of electric current is given by the following equation : -

H = I²Rt

Where H stands for heat energy, I for electric current, R for resistance and t for time.

An internal combustion engine uses fuel, of energy content 44.4 MJ/kg, at a rate of 5 kg/h. If the efficiency is 28%, determine the power output and the rate of heat rejection

Answers

Efficiency =  Power Output / Power Input

Power Input = Rate of Energy input = 44.4 MJ/kg * 5 kg/h

 = 222 MJ/h

But 1 hour = 3600seconds

222 MJ/h = 222 MJ/3600s =  0.061667 MW              J/s = Watts

Power input = 0.061667 MW = 61 667 W

From  Efficiency =  Power Output / Power Input

   28% =  Power Output / 61667

   Power Output = 0.28 * 61667

   Power Output = 17266.76 W
 
  Power Output = 17 267 W

 Rate of heat Rejection = Power input - Power output

                                        = 61667 - 17267 = 44400 W

Rate of heat Rejection = 44 400 W.


C- Copyright.

Describe two reasons why an alpha particle is less penetrating than a beta or gamma particle.

Answers

Alpha particles travel through the air they collide with oxygen and nitrogen molecules. While they collide with these molecules, they lose some energy until all energy are used up and they are absorbed. These particles can be absorbed by a sheet of paper or by the air. On the other hand, beta particles and gamma particles move faster than the alpha particles and are poor at ionizing atoms or molecules thus it takes more of the material to be able to absorb these particles.

Answer:

1. Heavy mass

2. greater charge

Explanation:

An alpha particle has two protons and two neutrons. It has +2 e charge. It is a heavy mass particle. Thus, when it tends to penetrate even a thin sheet, it loses its energy very quickly because of its interaction with the material particles.

Beta particle is a high energy electron or positron. It carries 1 unit charge and has very less mass in comparison to an alpha particle. Thus, it has more penetrating power than alpha particle.

A gamma particle is charge less and mass less highly energetic particle. Thus, it has highest penetrating power.
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