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A Prime number can be divided evenly only by 1 or itself. And it must be a whole number greater than 1.
Prime Factorization is the process of finding all the prime factors of an integer. Here is a simple way. In the first diagram below, the prime factors of integer 891 is 3, 3, 3, 3, and 11. More...
in Mathematics we use the following definition:
Permutation Formula
Suppose 0!=1
p(n,m)=n(n-1)(n-2)……(n-m+1)= n!/(n-m)!
Combination Formula
c(n,m)=p(n,m)/m!=n!/((n-m)!*m!)；c(n,m)=c(n,n-m);
More...Your college application essay or personal statement is your one opportunity to introduce yourself to the admission board, and put a voice to your test scores and GPA. Writing a self-reflective deeply personal essay can be trying. What do college admissions officers really look for?
Can you write?
Fundamentally the essay should serve to show your writing skills. Writing is an essential part of college courses, and the application essay allows admissions officers to see if you will be able to meet the demands of the writing curriculum at their school. Your essay should be well organized and properly formatted, and free of grammar and spelling mistakes. Thoroughly proofread – don’t just spellcheck. More...
When should you use who, and when should you use whom?
These days, it is becoming rare to see whom, because most of us use who in almost all cases. In fact, whom can sound rather pretentious and stuffy, For example:
To whom am I speaking?
Whom am I speaking to?
These sound very formal. Many of us would be more inclined to write or say:
Who am I speaking to?
Nonetheless, there are still a few stock phrases that use whom, even in contemporary English. For example:
To whom it may concern
In almost all other cases, it has become acceptable in contemporary English usage to use who.
Besides a diagram, you can also use the Thin Lens Equation and the Magnification Equation to determine characteristics of an image in curved lens (converging and diverging).
The Thin Lens Equation
1 / d0 + 1 / di = 1 / f More...
In this section, we study the reflection of light, focusing on how light is reflected in
The law of reflection states that the angle of incidence is equal to the angle of reflection. Remember that the angles are measured relative to the normal line. More...
From what we learned from the section on "Electromagnetism", we know that: 1) a changing electric field should create a magnetic field, and 2) a changing magnetic field can create an electric field.
An electromagnetic wave is a combination of electric and magnetic fields that vibrate together in space and time in a synchronous fashion and propagate through space (even vacuum) at the speed of light.
The electromagnetic wave is a transverse wave.
The electric and magnetic fields oscillate in the direction perpendicular to the direction of propagation.
The EM wave propagates because the electric field recreates the magnetic field and the magnetic field recreates the electric field.
Electromagnetic waves also experience the Doppler effect. As with sound, motion towards corresponds to a frequency shift upward and a wavelength shift downward, and motion away corresponds to a frequency shift downward and wavelength shift upward (the so-called red-shift).
For example, suppose we observed the light from a distant galaxy is received on Earth with a wavelength of 650nm. But it is known that the wavelength of this light upon emission was 625nm. Then we should know that this galaxy is receding from Earth.
Light is an electromagnetic wave –has both electric and magnetic parts and does not require a medium. A medium is any physical substance through which energy can be transferred. There are different types of electromagnetic waves, depending on their frequency levels and energy levels. Electromagnetic waves are formed when an electric field (shown as blue arrows) couples with a magnetic field (shown as red arrows). The magnetic and electric fields of an electromagnetic wave are perpendicular to each other and to the direction of the wave. Electromagnetic Waves have different wavelengths. When you listen to the radio, watch TV, or cook dinner in a microwave oven, you are using electromagnetic waves. Radio waves, television waves, and microwaves are all types of electromagnetic waves. They differ from each other in wavelength. Wavelength is the distance between one wave crest to the next. More...
Volume of cube = s3 where s is the length of any edge of the cube.
The gas theory works on the following assumptions:
The ideal gas law can be explained with the equation: More...
Virtual Image is an image formed by light coming from an apparent light source; light is not coming from the actual image location (actual light source).
