The Electromagnetic Spectrum Klein Indepedent School District克萊因獨立學區(qū)的電磁譜

1、map tap 2003-2004the electromagnetic spectrum1the electromagnetic spectrumwavelength/frequency/energymap tap 2003-2004the electromagnetic spectrum2teacher page content: physical sciencethe electromagnetic spectrum grade level: high school creator: dorothy walk curriculum objectives: sc 1; intro phys

2、/chem iv.a (waves)map tap 2003-2004the electromagnetic spectrum3map tap 2003-2004the electromagnetic spectrum4what is it? the electromagnetic spectrum is the complete spectrum or continuum of light including radio waves, infrared, visible light, ultraviolet light, x-rays and gamma rays an electromag

3、netic wave consists of electric and magnetic fields which vibrates thus making waves.map tap 2003-2004the electromagnetic spectrum5waves properties of waves include speed, frequency and wavelength speed (s), frequency (f) and wavelength (l) are related in the formula l x f = s all light travels at a

4、 speed of 3 s 108 m/s in a vacuummap tap 2003-2004the electromagnetic spectrum6wavelength, frequency and energy since all light travels at the same speed, wavelength and frequency have an indirect relationship. light with a short wavelength will have a high frequency and light with a long wavelength

5、 will have a low frequency. light with short wavelengths has high energy and long wavelength has low energymap tap 2003-2004the electromagnetic spectrum7map tap 2003-2004the electromagnetic spectrum8 radio waves low energy waves with long wavelengths includes fm, am, radar and tv waves wavelengths o

6、f 10-1m and longer low frequency used in many devices such as remote control items, cell phones, wireless devices, etc.map tap 2003-2004the electromagnetic spectrum9map tap 2003-2004the electromagnetic spectrum10microwaves longer than radio, shorter than light and infrared wavelength 1 x 10 - 4 m to

7、 1 x 10-1 m first used in radar, now used in communication, medicine and consumer use (microwave ovens)map tap 2003-2004the electromagnetic spectrum11map tap 2003-2004the electromagnetic spectrum12infrared waves invisible electromagnetic waves that are detected as heat can be detected with special d

8、evices such as night goggles used in heat lamps higher energy than microwaves but lower than visible lightmap tap 2003-2004the electromagnetic spectrum13map tap 2003-2004the electromagnetic spectrum14visible light the portion of the electromagnetic spectrum that human eyes can detect roy g biv (red,

9、 orange, yellow, green, blue, indigo, violet) red is the lowest frequency and violet is the highest frequencymap tap 2003-2004the electromagnetic spectrum15map tap 2003-2004the electromagnetic spectrum16ultraviolet waves higher energy than light waves can cause skin cancer and blindness in humans us

10、ed in tanning beds and sterilizing equipmentmap tap 2003-2004the electromagnetic spectrum17map tap 2003-2004the electromagnetic spectrum18x-rays high energy waves first discovered by roentgen used in medicine, industry and astronomy can cause cancermap tap 2003-2004the electromagnetic spectrum19map

11、tap 2003-2004the electromagnetic spectrum20gamma rays highest energy blocked from earths surface by atmospheremap tap 2003-2004the electromagnetic spectrum21map tap 2003-2004the electromagnetic spectrum22map tap 2003-2004the electromagnetic spectrum23time to think.1. what is the relationship between

12、 frequency and wavelength?2. what is meant by spectrum?3. what does roy g biv mean?map tap 2003-2004the electromagnetic spectrum24now, lets really think 4. can you actually see x-rays? support your answer. 5. which color is more energetic, red or yellow? 6. which type of wave travels faster, gamma o

13、r radio? 7. why are microwaves more dangerous than radio waves?map tap 2003-2004the electromagnetic spectrum25think about it. you have just been involved in a traffic incident that leaves you stranded on the side of the road. which part of the electromagnetic spectrum would be of the most use to you

14、 and why?map tap 2003-2004the electromagnetic spectrum26answers1. frequency and wavelength are properties of waves and since speed is constant for em waves, as frequency increases, wavelength decreases.2. spectrum is a continuum of all electromagnetic waves3, roy g biv is the difference colors of the visible light in order of longest wavelength to shortest wavelength.4. x-rays can not be seen, only the waves in the visible light portion are visible.5. yellow is higher