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

Power of 10

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