Presentation on theme: "Pop Quiz On a piece of paper write your name and the answers to the following questions. When you are finished place your answers in the tray on my desk."— Presentation transcript:
1Pop QuizOn a piece of paper write your name and the answers to the following questions. When you are finished place your answers in the tray on my desk. You have 10 minutesWhat are the prefixes represented by the ‘King Henry Died by drinking chocolate milk’ acronym pointsConvert the following into meters. Use scientific notation475nm25cm1500km points4.75x10-7m=2.5x10-1m1.5x106m
6Wave Particle DualityElectromagnetic radiation fits the rules of behavior for both waves and particles. This is known as wave- particle dualityThe reason for this is that just thinking of light (or any type of radiation) as a wave doesn’t explain certain things.Task: Use p84 of the black study guide to make notes of wave- particle duality. You have 10 minutes
7The energy of a photon (a particle of light or electromagnetic radiation) can be calculated using the following formulaPlanck’s constant, 6.63x10-34 JsE = h νEnergy, kJ/molFrequency, s-1As you can see energy is directly related to frequency
8Questions: Which of the following has a longer wavelength? Red light or blue light?Microwaves or radio waves?Infrared radiation or red light?Gamma rays or uv radiation?
9Which of the following has a greater frequency? Yellow light or green light?X-rays or gamma rays?UV radiation or violet lightAM radio waves or FM radio waves
10Which of the following has the lower energy? (remember energy is directly related to frequency)Red light or blue light?Microwaves or radio waves?Gamma rays or uv radiation?UV radiation or violet light?
11Springfields ‘Classic Rock’ radio station broadcasts at a frequency of MHz. What is the length of the radio wave in meters?(1 MHz = 1x106 Hz)c = λ ν3x108=λx102.1x1063x108λ=102.1x106=2.94m
12c = λ ν A beam of light has a wavelength of 506 nanometres. What is the frequency of the light? (1nm= 1x10-9m)What colour is the light?c = λ νν3x108=506x10-9x3x108ν=506x10-9=5.93 x1014Hz
13Blue light has a frequency of 6. 98x1014 Hz Blue light has a frequency of 6.98x1014 Hz. Calculate the wavelength of blue lightc = λ νx6.98x10143x108=λ3x108λ=6.98x1014=4.30x10-7mor430nm
14Now complete the worksheet Now complete the worksheet. It should be handed in at the end of the lessonHomework: Answer q5&6 on p126 0f the textbook