PHYSICS HIGH SCHOOL

Which of the following elements are non-reactive because their outer electron energy levels are full?A. Aluminum
B. Carbon
C. Krypton
D. Uranium

Answers

Answer 1
Answer: It would be Krypton, one of the noble gases. 

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A(n) is a material that causes a wave to bounce off of it

Answers

Answer;

A barrier, a surface or a boundary

Explanation;

Reflection is the property waves that occurs due to the bouncing back of a wave after it strikes a barrier.

Reflection involves change in direction of a wavefront at an interface between two different media such that the wavefront returns into the medium from which it originated. In other words, the direction of the wave changes when they bounce of a barrier or a surface.

Its a Reflector

Reflector is some sort of material that is used to collect or bounce off energy such as sound, light, or radio wave

Usually it took form in some sort of parabolic that revolve around an axis

The electron configuration of nitrogen (N) is

Answers

Answer: 1s^22s^22p^3

Explanation:

Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.

The electrons are filled according to Afbau's rule in order of increasing energies and thus the electronic configuration  for nitrogen with atomic number of 7 which also contains 7 electrons is:

N:7:1s^22s^22p^3
The electron configuration of (N) is 1s²2s²2p³

What is the molar mass, in grams, of a mole of an element equal to?A. The number of electrons
B. The atomic weight of the element
C. The atomic number of the element
D. The number of neutrons in the element

Answers

Answer : Molar mass is equal to the atomic weight of the element.

Explanation :

The ratio of the mass of a given substance to the amount of substance is called as the molar mass of that substance. It is denoted by M. Its SI unit is kg/mol but it is usually expressed in g/mol.

In simpler form it is equal to the atomic weight of the substance.

For example, the molar mass of water can be calculated as :

M=2* 1+2(8)=18\ g/mol

Hence, the correct option is (B) "The atomic weight of the element".

The correct answer is B. The atomic weight of the element 

If the sun rises at 5 am and sets at 6 pm, what is the length of the day? a) 11 hours b) 12 hours c) 13 hours d) 24 hours

Answers

Answer:

24 hours

Explanation:

In a cathode ray tube, the number of electrons that reach the fluorescent screen is controlled by the A. cathode.
B. grid.
C. anode.
D. deflecting plate.

Answers

In a cathode ray tube, the number of electrons that reach the fluorescent screen is controlled by the grid. The correct option among all the options given in the question is option "B".When current issupplied to the heater, it causes the cathode to emit electrons. The electronspass through opening of the grid before reaching the anode. By controlling thenumber of electrons passing through the grid, the number of electrons reachingthe anode can also be controlled. 

Answer: B. GRID

Explanation: I JUST TOOK THE PF EXAM AND GOT IT CORRECT!!!!

In a given circuit, the supplied voltage is 1.5 volts. One resistor is 3 ohms and the other is 2 ohms. Use Ohm's law to determine the current in the circuit. 0.3 amps 1.5 amps 7.5 amps 3.3 amps The purpose of a fuse or circuit breaker is _____. to speed up the current to slow down the current to stop current that is flowing too fast to stop current that is flowing too slow

Answers



Part #1:
You haven't mentioned whether the resistors are in series
or in parallel.  It's going to make a difference.

-- If the resistors are in series, then their net effective resistance
is their sum.

           (3 ohms) + (2 ohms) = 5 ohms.

Current in the circuit is

                      (supply voltage) / (total resistance)

                 =            (1.5 volts) / (5 ohms) = 0.3 ampere . 


-- If the resistors are in parallel, then their net effective resistance
   is   
                   (their product) / (their sum)

        = (1 ohms x 2 ohms) / (1 ohm + 2 ohms)

        =              (2 ohms²) / (3 ohms)  =  2/3 ohm .

Current in the circuit is

                      (supply voltage) / (total resistance)
          
                 =   (1.5 volts) / (2/3 ohm)  =  1.0 ampere .

I guess your resistors are in series, because 0.3 amp
is one of the choices but 1.0 amp isn't.
______________________________________

Part #2.
When it comes to talking about electric current, the terms
"speed up", "slow down", "fast", and "slow" are somewhere
between meaningless and absurd.

The purpose of a fuse or circuit breaker is to shut down a current
that is too great ... too great a magnitude, too many electrons all
trying to crowd their way through the wire at the same time, like
100 lines of ants all carrying bread crumbs through a straw and
back to their hole, when there was only supposed to be one or
two lines.

Speed has nothing to do with it.  All electric currents flow through
wires at the same speed, at least in high school.  It's a matter of
Amperes, which has nothing to do with speed.
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