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NatuurkundeMiddelbare schoolvwoLeerjaar 3

This lesson contains 15 slides, with interactive quizzes and text slides.

## Items in this lesson

#### Slide 1 -Slide

Learning objectives
• You can describe how a transmitter and a recipient use electromagnetic waves to transport information.
• You can describe three features of electromagnetic radiation.
• You can do calculations using the wavelenght, speed of light and frequency.
• You can classify the different types of electromagnetic radiation within the elctromagnetic spectrum.
• You can describe the effects of ionising and non-ionising radiation.

#### Slide 2 -Slide

Throughout the universe, objects emit radiation
Radiation is a form of light that is not always visible!
• Visible light
• Wi-Fi

#### Slide 3 -Slide

Elektromagnetic spectrum
Radiation occurs in different ways; the so-called "spectrum". The stronger the radiation, the smaller its wavelength.

#### Slide 4 -Slide

• Radiation that can destroy molecules.
• X-rays and gamma-rays are highly ionising. Extremely small quantities can cause health damage.

#### Slide 5 -Slide

Elektromagnetic waves
• 3D
• Electromagnetic waves propagate indipendently - even through a vacuum.
•  Electromagnetic waves always have the same speed : 3,0*10^8 m/s. This is the speed of light and it  carries symbol c.

#### Slide 6 -Slide

Frequency and wavelenght
The number of waves that pass
in 1 second, is called the
frequency (Hz).
The distance between 2
successive wave peaks is
called Wavelength.

#### Slide 7 -Slide

• Lambda        = wavelengthe in metres (m)
• c = speed of light in metres per second (m/s)
• f = frequency in hertz (Hz)
λ=fc
λ

#### Slide 8 -Slide

A laser radiates blue light with a wavelength of 470 nm.
Calculate the frequency of this blue light.
λ=fc

#### Slide 10 -Slide

Elektromagnetic waves

#### Slide 11 -Slide

The transmitter
The moving electrons generate an electromagnetic field, which emits radiation at a certain frequency f.
The Recipient
Electrons in the antenna of the receiver start to vibrate at frequency f, under the influence of the radiation. The signal has now been transmitted

#### Slide 12 -Slide

On 6 august 2012, the mars rover Curiosity landed on the planet. The signal from Curiosity only reached Earth after 13 minutes and 48 seconds.

Calculate the distance between Mars and the Eart at that moment. Give the answer in millions of kilometers.

#### Slide 13 -Open question

c = 3,0*10^8 m/s
1 million = 1.000.000

#### Slide 14 -Slide

CH 6 § 1 - 2,3,4,6,9,10