ENERGY FROM AN ATOM. LIGHT BEHAVES LIKE A WAVE Recap PrefixSymbolMeaning Scientific Notation Tera T1...
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Transcript of ENERGY FROM AN ATOM. LIGHT BEHAVES LIKE A WAVE Recap PrefixSymbolMeaning Scientific Notation Tera T1...
ENERGY FROM AN ATOM
LIGHT BEHAVES LIKE A WAVE
RecapPrefix Symbol Meaning Scientific
Notation
Tera T 1 000 000 000 000 1012
Giga G 1 000 000 000 109
Mega M 1 000 000 106
*Kilo K 1 000 103
Hecto H 1 00 102
Deka Da 1 0 101
Base : meter, mole, gram, & liter = 1
Deci d 1/1 0 0. 1 10-1
*Centi c 1/1 00 0. 01 10-2
*Milli m 1/1 000 0. 001 10-3
Micro µ 1/1 000 000 0. 000 001 10-6
Nano n 1/ 1 000 000 000 0. 000 000 001 10-9
Pico p 1/ 1 000 000 000 000 0. 000 000 000 001 10-12
Length Scale:.1 meter (m): the average man is about 2 meters tall
1 centimeter (cm): the length of a red ant 1 cm = 1x10-2 m = 0.01 m
1 millimeter (mm): the size of a pencil point 1 mm = 1x10-3 m = 0.001 m
1 micrometer/micron (μm): 100 μm thickness of a sheet of paper 1 μm = 1x10-6 m = 0.000001 m
1 nanometer (nm): 2 nm is the width of a DNA helix 1 nm = 1x10-9 m = 0.000000001 m
WAVES, FREQUENCY, & ENERGY
C = λν
• c =speed of light= 3.00 x 108 m/s• =Frequency units Hertz = = sec-1
• λ =wavelength- unit nm
Calculate the wavelength in nanometers of yellow light emitted from a sodium lamp if the frequency is 5.10 x 1014 Hz.
G, W, N
Calculate the wavelength in nanometers of yellow light emitted from a sodium lamp if the frequency is 5.10 x 1014 Hz.
G, W, N
ATOMIC SPECTRA
E = h
• E=E= Energy of radiation= quantum of energy
units Joules (J)• =Frequency units Hertz = = sec-1
• h =Planck’s constant h = 6.626 × 10−34 J• s
Ultraviolet radiation has a frequency of 6.8 × 1015 Hz. Calculate the energy, in joules, of the photon.G, W, N
Draw the correct wave
RADIO WAVES
longest lowest
RADIO
Antenna picks up the radio waves & converts it to sound waves.• Each station broadcasts at a different
MRI (MAGNETIC RESONACE IMAGING) Uses Short wave radio waves with a magnet to
create an image.
MICROWAVES
RADAR (Radio Detection and Ranging)
Sends out radio waves & measures the time it takes them to return
Microwave ovens
Waves transfer energy to the water in the food causing them to vibrate which in turn transfers energy in the form of heat to the food.
INFRARED RAYS
VISIBLE LIGHT
ULTRAVIOLET RAYS
Used to kill bacteria.
(Sterilization of equipment)
Causes your skin to produce
vitamin D (good for teeth and
bones)
X- RAYS
Bones and teeth absorb x-rays
light part of an x-ray image indicates a place where the x-ray was absorbed
The rays pass through the cracks and the cracks appear dark on film.
Engineers use to check for tiny cracks in structures.
GAMMA RAYS
Used in radiation treatment to kill cancer cells.
EXPLODING NUCLEAR WEAPONS EMIT GAMMA RAYS.
UNIQUE ATOMIC SIGNATURESEach atom has a specific set of energy levels, and thus a unique set of photon wavelengths with which it can interact.
FLAME TESTMetal Flame Color
Strontium
Calcium
Copper
Sodium
Potassium
Unknown A
Unknown B
Make your own firework