QUATUM MECHANICS,ATOMIC STRUCTURE AND PERIODICITY

Question 1

WHAT IS EMR?

Answer 1

THIS IS ONE WAY/CHANNEL THAT ENERGY TRAVELS THROUGH SPACE IS BY ELECTROMAGNETIC RADIATION.
-EMR

Question 2

STATE THR 3 CHARACTERISTICS OF WAVES?

Answer 2

WAVELENGTH-LAMBDA
FREQUENCY-nu
SPEED 3.8 m/s

ALL RADIATIANT ENERGY TRAVELS AT SPEED OF LIGHT IN A VACCUM AND TRAVELS AS WAVES.

QUESTION TO FIND OUT IS QHY TRAVEL AT SPEED OF LIGHT AND AS WAVES AND NOT ANYTHING ELSE?

Question 3

EXPLAIN THE RELATIONSHIP BETWEEN WAVELENGTH AND FREQUENCY.

Answer 3

THE WAVE WITH SHORTEST WAVELENGTH HAS HIGHEST. THIS IA AN INVERSE RELATIONSHIP.

C=WAVELENGTH (LAMBDA) ×FREQUENCY.

C=SPEED OF LIGHT =2.9979×10^8m/s

Question 4

HOW DO YOU CALCULATE FOR CHANGE IN ENERGY OF A SYSTEM?

Answer 4

MAX PLANK POSTULATED THAT ENERIS GAINED OR LOST ONLY IN WHOLE NUMBER MULTIPLES OF THE QUANTITY hv,

PLANKS CONSTANT =6.626×10^-34 J.S

CHANGE IN ENERGY =nhv

n=1,2,3,….
v=frequency
h=planks CONSTANT

ENERGY EXISTS IN ONLLY IN DISCRETE UNITS OF SIZE hv AND EACH UNIT IS CALLED A QUANTUM.

ENERGY IS QUANTIZED.IT ALSO GOT PARTICULATE PROPERTIES.

Question 5

WHAT IS EMR MADE OF?

Answer 5

ITS A STREAM OF PHOTONS OR SMALL CHUNCKS OF ENERGY OR PARTICLES OF LIGHT

ENERGY OF A PHOTON IS DIRECTLY PROPORTION TO WMR FREQUENCY.

E=hv

LEFT SIDE OF EQUATION IS DEALING WITH PROPERTIES OF ENERGY AND RIGHT SIDE, WAVE PROPERTIES

Question 6

WHAT IS THE PHOTO ELECTRIC EFFECT?

Answer 6

THIS IS THE PHENOMENON IN WHICH ELECTRONS ARE EJECTED FROM A SURFACE OF A METAL QHEN LIGHT STRIKES IT.

EMITTED ELECTRONS ARE CALLED PHOTO ELECTRONS

Question 7

WHAT IS THE K E OF THE EJECTED ELECTRON?

Answer 7

K.E electron=1/2mv^2=hv-hvo

Question 8

HOW DO YOU CALCULATE ENERGY OF WLECTRON IN AN ATOM?

Answer 8

E=-b/n2 b=2.187×10^-18 j
or
E=-2.187×10^-18J(z2/n2)

z=atomic number
n=Wnwrgy level occupied by that electron.