Sound Waves - Science Tutor

November 27, 2016

Speed of sound
The mechanical vibrations that can be interpreted as sound are able to travel through all forms of matter: gases, liquids, solids, and plasmas. The matter that supports the sound is called the medium. Sound cannot travel through a vacuum.
Speed:
v=√
B
ρ

B - coefficient of stiffness, the bulk modulus (or the modulus of bulk elasticity for gases),
ρ - the density
Particle displacement
s=s+mcos(kx−ωt)
sm - amplitude of displacement
k - the wavenumber
x - the distance the point has traveled from the wave\'s source
ω - the angular frequency of the wave
t - the time elapsed
Pressure of the medium
Sound is a mechanical wave that is an oscillation of pressure Δp transmitted through a solid, liquid, or gas
Δp=Δpmsin(kx−ωt)
Δpm - pressure amplitude.
Δpm=vρωsm
sm - particle displacement amplitude
v - speed of sound in medium
ρ - density of the medium
k - wavenumber
x - the distance the point has traveled from the wave\'s source
ω - the angular frequency of the wave
t - the time elapsed
Interferency
Two traveling waves which exist in the same medium will interfere with each other. If their amplitudes add, the interference is said to be constructive interference, and destructive interference if they are \"out of phase\" and subtract.
Φ=
ΔL
Λ
2Π
ΔL - the difference in distance defeated by the waves to reach a common point
Λ - waves length

When the phase difference of the two waves is an integral multiple of 2Π, theinterference is constructive:
Φ=m2Π
m - integral number

Fully destructive interference (both wave expires) occurs when the phase difference is equal to an odd multiple ofΠ:
Φ=(2m+1)Π
m - integral number
Sound intensity
The intensity is the product of the sound pressure and the particle velocity:
I=pv, where:
p - sound pressure
v - speed of sound
It is also defined as:
I=
P
S
, where
P - acoustic power
S - sound receiving area

The intensity at a distance r from a point source that emits a sound wave is equal:
I=
P
4Πr2

P - acoustic power

The intensity and amplitude of sound wave displacement sm involves the dependence:
I=
1
2
ρvω2sm2
ρ - density of medium
v - speed of sound
ω - the angular frequency of the wave
Sound intensity level
L=10log
I
I0
,
I0=10−12
W
m2
 - standard reference sound intensity,
I - sound intensity
Doppler Effect
The perceived frequency f´ is related to the actual frequency f0 and the relative speeds of the source vs, observer vo, and the speed v of waves in the medium by
f′=f0
v(+/−)v0
v(+/−)v0

The choice of using the plus (+) or minus (-) sign is made according to the convention that if the source and observer are moving towards each other the perceived frequency f´ is higher than the actual frequency f0. Likewise, if the source and observer are moving away from each other the perceived frequency f´ is lower than the actual frequency f0.

Sound Waves - Science Tutor Sound Waves - Science Tutor Reviewed by Anoop Kumar Sharma on November 27, 2016 Rating: 5

Science Tutor - Intro - Video - Official2

November 27, 2016
Science Tutor - Intro - Video - Official2 Science Tutor - Intro - Video - Official2 Reviewed by Anoop Kumar Sharma on November 27, 2016 Rating: 5

Science Tutor - Intro - Video - Official

November 27, 2016
Science Tutor - Intro - Video - Official Science Tutor - Intro - Video - Official Reviewed by Anoop Kumar Sharma on November 27, 2016 Rating: 5

thought | 26-11-2016

November 25, 2016


thought | 26-11-2016 thought | 26-11-2016 Reviewed by Anoop Kumar Sharma on November 25, 2016 Rating: 5

Thought of Day | 25-11-2016

November 25, 2016
Educating the mind without educating the heart is no education at all
Thought of Day | 25-11-2016 Thought of Day | 25-11-2016 Reviewed by Anoop Kumar Sharma on November 25, 2016 Rating: 5

Though of Day | 24-11-2016

November 23, 2016
Don't woke ua with the
f regret of what you couldn't
accomplish yesterday. Woke
up while thinking about what
you will be able to achieve today
Though of Day | 24-11-2016 Though of Day | 24-11-2016 Reviewed by Anoop Sharma on November 23, 2016 Rating: 5

Thought of Day | 23-11-2016

November 22, 2016
A true friend sees the 1st tear,
catches the 2nd, and stops the 3rd!!"

Thought of Day | 23-11-2016 Thought of Day | 23-11-2016 Reviewed by Science Tutor on November 22, 2016 Rating: 5

Thought of Day | 22-11-2016

November 21, 2016
This is not just another day, this is yet another chance to make your dreams come true. 

“ Good morning ” 


Thought of Day | 22-11-2016 Thought of Day | 22-11-2016 Reviewed by Anoop Kumar Sharma on November 21, 2016 Rating: 5

Thought of Day | 21-11-2016

November 21, 2016
"When the middle is well and good, the past is repaired and the future is prepared."

Thought of Day | 21-11-2016 Thought of Day | 21-11-2016 Reviewed by Anoop Kumar Sharma on November 21, 2016 Rating: 5

Introduction to Microsoft DOS

November 20, 2016

M.S. DOS:

     M.S. DOS stands for Microsoft Disk Operating Systems. MS DOS is the operating system for the IBM’s personal computers and their compatibles. It was released in 1980, when IBM launched its first personal computer. DOS as an operating system has the following features in addition to those which are common to other operating systems.√ Single user operating system√ Hierarchical file structure√ Supports only 80 XXX architecture personal computer√ Memory access limit 640 KB.

DOS Commands:

     DOS contains large number of program files termed as DOS commands. We can use these commands by typing their names on DOS prompt one at a time. These commands given by user tells the computer how to perform a specific job. DOS commands can be classified into two types:

     1)    Internal DOS Commands
 2)   External DOS Commands

Internal DOS Commands:

     Internal DOS commands are those commands which are loaded in the computer system automatically as soon as computer is booted. All these commands are stored in a file called COMMAND.DOS which get loaded at the time of booting.Some of major characteristics of internal commands are:

1)    Memory Resident Commands: These are most commonly used commands which are loaded into the Computer’s memory when DOS is booted.
2)    Fast Access: The fast access is due to their presence in the main memory and so CPU can access it faster than the information stored in the external memory.
3)    If you display the directory, file name of these commands will not be visible, because these form the part of a file called COMMAND.COM.
Examples: COPY, DEL, PATH, DATE, TIME etc.

External DOS Commands:

      External DOS commands are those commands are those commands which are loaded externally in computer system. These commands are not stored in a single file like internal DOS Commands. Each of these commands require a separate executable file.
Some of the major characteristics of external commands are:

     1)    Like conventional program files, these reside on the disk.
2)    To execute these commands, the presence of the corresponding file in the disk is essential.
3)    These files names are displayed when directory is listed.
4)    These files have the extensions .COM or .EXE or .BAT.

Download The PDF file for these commands with example. Click on Pay Now and Do the Transaction after successful payment you get the complete PDF eBook.
Introduction to Microsoft DOS Introduction to Microsoft DOS Reviewed by Science Tutor on November 20, 2016 Rating: 5

Various terms used in computer and their full names

November 16, 2016
Various Terms Used In Computer System
  • CPU : Central Processing Unit
  • RAM : Random Acess Memory
  • ROM : Read Only Memory
  • SIMM : Single in-Line Memory Module
  • DIMM : Double in-Line Memory Module
  • SATA : Serial Advanced Technology Attachment
  • HDD : Hard Disk Drive
  • FDD : Floppy Disk Drive
  • DVD : Digital Video Disk
  • SDRAM : Synchronous Dynamic RAM
  • DDR : Double Data Rate
  • SMPS : Switch Mode Power Supply
  • ATX : Advanced Technology Extended
  • USB : Universal Serial Bus
  • LPT : Line Print Terminal
  • BIOS : Basic Input Output System
  • CMOS : Complementry Metal Oxide Semiconductor
  • ISA : Industry Standard Architecture
  • PCI : Peripheral Component Integrated
  • AGP : Accelerated Graphics Port
  • AMR : Audio Modem Riser
  • CNR : Communication Network Riser
Various terms used in computer and their full names Various terms used in computer and their full names Reviewed by Anoop Kumar Sharma on November 16, 2016 Rating: 5

How to Get Your Bank Mini Statements on Your Mobile Without the Internet

November 14, 2016
Get Your Bank Mini Statements on Your Mobile Without the Internet

Dial * 99# to do basic Banking instantly. One can check balance for accounts, mini statement where the mobile number is registered & no internet required. Below are the direct codes for banks:

* 99* 41#-State Bank of India
* 99* 42#- Punjab National Bank
* 99* 43#-HDFC Bank
* 99* 44#-ICICI Bank
* 99* 45#-AXIS Bank
* 99* 46#-Canara Bank
* 99* 47#- Bank Of India
* 99* 48#-Bank of Baroda
* 99* 49#-IDBI Bank
* 99* 50#-Union Bank of India
* 99* 51#-Central Bank of India
* 99* 52#-India Overseas Bank
* 99* 53#-Oriental Bank of Commerce
* 99* 54#-Allahabad Bank
* 99* 55#-Syndicate Bank
* 99* 56#-UCO Bank
* 99* 57#-Corporation Bank
* 99* 58#- Indian Bank
* 99* 59#-Andhra Bank
* 99* 60#- State Bank Of Hyderabad
* 99* 61#- Bank of Maharashtra
* 99* 62#- State Bank of Patiala
* 99* 63#- United Bank of India
* 99* 64#-Vijaya Bank
* 99* 65#-Dena Bank
* 99* 66#-Yes Bank
* 99* 67#-State Bank of Travancore
* 99* 68#-Kotak Mahindra Bank
* 99* 69#-IndusInd Bank
* 99* 70#- State Bank of Bikaner and Jaipur
* 99* 71#- Punjab and Sind Bank
* 99* 72#-Federal Bank
* 99* 73#-State Bank of Mysore
* 99* 74#-South Indian Bank
* 99* 75#-Karur Vysya Bank
* 99* 76#-Karnataka Bank
* 99* 77#-Tamilnad Mercantile Bank
* 99* 78#-DCB Bank
* 99* 79#- Ratnakar Bank
* 99* 80#-Nainital Bank
* 99* 81#-Janata Sahakari Bank
* 99* 82#-Mehsana Urban Co-Operative Bank
* 99* 83#-NKGSB Bank
* 99* 84#-Saraswat Bank
* 99* 85#-Apna Sahakari Bank
* 99* 86#-Bhartiya Mahila Bank
* 99* 87#- Abhyudaya Co-Operative Bank
* 99* 88#-Punjab & Maharashtra Co-operative Bank
* 99* 89#-Hasti Co-Operative Bank
* 99* 90#- Gujarat State Co-Operative Bank
* 99* 91#- Kalupur Commercial Co-Operative Bank.

Also, u can dial * 99* 99# to know your Aadhaar linking and Over Draft Status.

☝🏼 *Most useful message..*
How to Get Your Bank Mini Statements on Your Mobile Without the Internet How to Get Your Bank Mini Statements on Your Mobile Without the Internet Reviewed by Anoop Sharma on November 14, 2016 Rating: 5

Derivative of Functions

November 13, 2016
Differentiation and the derivative
Differentiation is the action of computing a derivative. The derivative of a function f(x) of a variable x is a measure of the rate at which the value of the function changes with respect to the change of the variable. It is called the derivative of f with respect to x. If x andy are real numbers, and if the graph of fis plotted against x, the derivative is the slope of this graph at each point.

The simplest case, apart from the trivial case of a constant function, is when y is a linear function of x, meaning that the graph of y divided by x is a line. In this case, y=f(x)=mx+b, for real numbersm and b, and the slope m is given by

m=
change in y
change in x
=
Δy
Δx
Derivatives of elementary functions
Function y=f(x)Derivative f′(x) off(x)
f(x)=cf(x)′=0
f(x)=ax+bf(x)′=a
f(x)=ax2+bx+cf(x)′=2ax+b
f(x)=xaf(x)′=a*xa−1
f(x)=√xf(x)′=
1
2√x
f(x)=
a
x
f(x)′=
−a
x2
Exponential, logarithmic, trigonometric
Function y=f(x)Derivative f′(x) off(x)
f(x)=exf(x)′=ex
f(x)=ln(x)f(x)′=
1
x
f(x)=loga(x)f(x)′=
1
xln(a)
f(x)=sinxf(x)′=cosx
f(x)=cosxf(x)′=−sinx
f(x)=tgxf(x)′=
1
cos2x
f(x)=ctgxf(x)′=−
1
sin2x
Derivative of Functions Derivative of Functions Reviewed by Anoop Kumar Sharma on November 13, 2016 Rating: 5
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