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ATTAINING ACADEMIC EXCELLENCE
There are many ways to attain academic excellence one of the major ones being studying effectively.
For students this is a big problem; many students don't study, and a few of those who do study hard but not smartly.
How smart you work matters more than how hard you work!
I would share with you effectual tips on .
Tag along!

Question:
Explain photoelectricity

Answer:
Photoelectricity is a phenomenon by which the incidence of light or electromagnetic radiations of appropriate frequency or wavelength on the surface of a clean metal brings about the emission of photoelectrons.

Question:
how is photoelectricity related or not to thermionic emission?

Answer:

Photoelectricity
Photoelectricity is a phenomenon by which electrons are emitted from the surface of a clean metal when light or electromagnetic radiations of appropriate frequency or wavelength is incident on the surface of the metal.
Thermionic emission
This refers to the emission of ions from the surface of a metal when it is strongly heated to a certain degree.

Similarities
In both, metal is involved

Differences between photoelectricity and thermionic emission
1. In photoelectricity, electrons are emitted while ions are emitted in the case of Thermionic emission.
2. Incidence of light of appropriate frequency or wavelength brings about photoelectricity while heat is involved in thermionic emission.

Phychembioqa.blogspot.com

BIOLOGY TIME!!!

Question
Who can describe concisely the process of digestion of food through the alimentary canal?

Lets see who the biology guru is!

Endeavor to share your ideas, don't be shy!
We await your response

Question
Distinguish between speed and velocity
Answer:
Velocity is the time rate of change of displacement.
It is a vector quantity measured in metre per second (m/s).
Speed is rate of change of distance moved per unit time in an unspecified direction.
It is a scalar quantity measured in metre per second (m/s).

DIFFERENCES BETWEEN SPEED AND VELOCITY
By formula
Speed, v=distance/time
while
Velocity, v=displacement/time.
If you carefully look at the formulae above, you can see that the main difference in the formula between the two is distance and displacement.
Click the link to know about the differences between distance and displacement.
https://m.facebook.com/story.php?story_fbid=1790449981174971&id=1776651919221444&__tn__=%2As
D
Speed is a scalar quantity while velocity is a vector quantity.
Speed requires only magnitude to be specified while velocity requires magnitude and direction to be specified.if you say the velocity of a body is 10m/s, you have not completely stated the velocity of the body, you have only stated the magnitude(size) of the velocity of that body.
SIMILARITIES BETWEEN SPEED AND VELOCITY
Velocity and speed are measured in metre per second (m/s).
Both are denoted by “v”
Both velocity and speed have magnitude

Question:
What are the differences and similarities between distance and displacement
Answer
Of the most confusing terms in physics are the two above (i.e distance and displacement) terms are used to mean the same thing but there are distinctions between them especially when dealing with linear motion.
Distance is the separation between two points or the gap between any two positions in space. e.g if a person moves from a poiunt P to a point Q, the distance moved by the person would be the length PQ.
It is a scalar quantity(as such it has only magnitude but no direction) measured in metre(m).
Displacement is the distance moved in a specified direction (i.e on a straight line). It is the distance moved by an object from its initial position to its final position.
It is a vector quantity measured in metre(m).
DIFFERENCES BETWEEN DISTANCE AND DISPLACEMENT
Distance is a scalar quantity while displacement is a vector quantity.
Distance requires only magnitude to be specified while displacement requires not just magnitude but also direction to be specified i.e. if you say the distance moved by a person is 50m, then you have completely stated the distance moved by the person. But if you say the displacement of a body is 10m, you have not completely stated the displacement of the body, you have only stated the magnitude(size) of the displacement of that body.
SIMILARITIES BETWEEN DISTANCE AND DISPLACEMENT
Both distance and displacement are measured in metre (m).
Both are denoted by “s”
Both quantities have magnitude
NOTE: the distance moved by a body in a straight line is equal in magnitude to the displacement of the body.

HOW DO I ASK A QUESTION ON THIS PAGE?
Questions to be asked should be written in the format below.
1. The topic under which the question is to be asked
2. Question in details without shortening the content of the question (like using @, u and d to mean at, you and the respectively).

For example:
Linear motion
Question:
Distinguish between distance and displacement,
Distinguish between speed and velocity.

ELECTRICITY 2
OHM’S LAW
Ohm’s law states that the current (I) passing through a metallic conductor (e.g wire) is directly proportional to the potential difference (V) across the ends of the conductor provided temperature and other physical properties of the conductor(e.g the length, cross-sectional area of the conductor, etc) is kept constant.

Mathematically, the law is interpreted as
V α I
Turning the above interpretation into an equation, we have
V=I × Constant
The constant in the above equation is the resistance (R) of the conductor
Thus,
V=I × R
V=IR
Where, V= Potential difference across the conductor
I= The current flowing through the resistor
R= Resistance

Potential difference (V) is measured in volt(v)
The current (I) is measured in ampere (A)
Resistance (R) is measured in ohm (Ω)


(V-I GRAPH)
It can be inferred from the law that an increase in the potential difference (V) will result in a proportionate increase in the current (I) and vice versa, since both are directly proportional.
As such, a graph of potential difference (V) against current (I) i.e (V-I graph) is a straight line graph.
The slope of the graph is ΔV/ΔI which gives the resistance, R, of the material.

ELECTRICITY 1
CURRENT ELECTRICITY
CURRENT
Current (I) is the rate at which electric charges flow through a conductor.
It can be measured using an ammeter or milliameter (for small currents).
It unit is ampere (A)
It is the expression of the quantity of charges flowing through a conductor per seconds.
Mathematically, it is expressed as
Current, I = Charge, Q / Time, t
i.e I=Q/t
Hence,
1 ampere is defined as a coloumb of electricity per seconds and 1 coloumb as the quantity of electricity passing through a conductor in a second when the current flowing through it is 1 ampere.
To make calculations easier and convenient, the use of submultiples have been introduced
e.g instead of writing 0.000001A or 0.001A one can write 1µA (1 microAmpere) or 1mA (1 milliAmpere)
Where micro, µ= 1 × 10-6 or 0.000001
milli, m= 1 × 10-3 or 0.001
A sensitive ammeter is one that can measure very small current.
An accurate ammeter is one whose measurement is close to the actual value of the current.

Upon the commencement of the new term, as a page that is created with the major aim of assisting student academically in increasing their academic efficiency,
The page is now open for questions.
(take note of the format in which the questions should be)
Invite your friends and classmates to like the page, and begin to ask questions.
THEY’LL FIND IT HELPFUL AND RESOURCEFUL.