Science_.txt

• author "me"
• fileName "Science
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• Light
• Energy u can see made of photons

Tiny particles of light. Energy released by atoms through photons. Einstein won nobel prize for discoverin in 1921

Empedocles said aphrodite made eye with fir in it.

Christian huygens agreed with davinci that light is wave. Pointed out when two beams cross they pass tgru eachother

Treatise on light

Scottish james maxwell discovered that waves travel at constant speed. He thought it was radiation. Supported huygens

German heinrich hertz discovered frequencies of light such as violet cause metals to lose electrons. Used red lught no effect. Showed. Violet light were stronger. Photoelectric effect. Agreed with newton

Movement of electrons when light shines on it

Einstein used previous works to explain photons. Photons energy level depended on light frequency

Einstein studied photoelectric effect. Indicated particle nature. Also as wave.

Einstein created. States light is a wave and particle. Received nobel prize in 1922 for it

Scientists think lught is a wave and particle. Particles in wave pattern

Theoretical physics. Replaces classical mechanics at atomic and subatomic levels. From latin quantum means how many. Based on probability.

Range of electromagnetic waves in order. Transverse waves that transfer electric and magnetic energy. Travel at same speed. Different wavelengths and frequencies. Travel in vacuum. Electric and magnetic.

Visible.light. mostly invisible

Longest wavelength. Lowest frequency. Radio tv radar

Wireless and microwAves

Energy as heat. Qll objects give off. Cant see,only feel. Shorter wavelengths and higher frequencies than microwaves

Type of infrared. Thermographic cameras detect radiation and make images of it

Electromagnetic waves that are visible To human eye

Composed of seven colors roy g biv . Form white. Newton discovered it. Coined term spectrum from Latin spectaculum or appearance

Frequencies hugher than visible light. More energy. Can damage or kill cells. Uv lamps used to kill hospital bacteria

Higher grequencies than uv rays. Used in medicine

Shortest wavelength and hughest frequency. Greatest energy. Given off in nucleur stuff

Speed wavelength frequency and amplitude.

In a vacuum measured at 300000 km/s or 186000 m/s

Distance fro crest to trough of one wave to crest to tro of another

Number of light wavs that pass by each second

Height of wave

Give off own light

Can be seen bc they reflect light. Ex moon

Block light. Ex ur hand

Allow light o pass thru unchanged. Ex clear glass water air

Qllow some scattered light to pass thru. No details. Ex frosted glass and wax paper

Bouncing back of wave when hits surface thru which it cant pass. Objects r seen bc light reflects off them

Bending of light waves as enter other medium. When light enters new medium chabge in speed causes bending

Curved piece of glass used to refract light. Different shapes . New image based on shape