Light is a small part of the

1.   ?    Electromechanical spectrum
2.   ?    Spectrum
3.   ?    Electromagnetic Spectrum
4.   ?    Electroweak Spectrum

Which one of these statements is NOT true about the electromagnetic spectrum.

1.   ?    Radiation travels in straight lines
2.   ?    Radiation travels at 300 000 000 m/s
3.   ?    Radiation can travel in a vacuum.
4.   ?    Radiation needs a material to travel in.

How are the wave energy and the wavelength in the electromagnetic spectrum related?

1.   ?    As wavelength gets shorter, the waves have more energy.
2.   ?    As wavelength gets longer, the waves have more energy.
3.   ?    As wavelength gets shorter, the waves have less energy.
4.   ?    As wavelength gets shorter, the waves have the same energy.

Which one of the following waves is used for radio broadcasting

1.   ?    Ultra violet
2.   ?    infra red
3.   ?    Gamma
4.   ?    FM (VHF)

Which one of the following waves do not have a hazard associated?

1.   ?    Infra red
2.   ?    Light
3.   ?    X-ray
4.   ?    Gamma ray

Which is the correct unit for frequency?

1.   ?    Volts
2.   ?    Watts
3.   ?    Hertz
4.   ?    metres per second

Infra red is used in communication. Which one of these is the correct explanation?

1.   ?    IR is used in lasers that shine through the air.
2.   ?    IR is used in optical fibres which can make it go round bends
3.   ?    IR is beam down from satellites to receivers on the ground
4.   ?    IR is only useful to those who have eyes that can see infra red.

Which one of these correctly shows the wave equation?

1.   ?    wave speed = frequency x wavelength
2.   ?    wave speed = frequency + wavelength
3.   ?    wave speed = frequency ÷ wavelength
4.   ?    wave speed = wavelength ÷ frequency

What is the frequency of a radio wave 2 m in wavelength?

1.   ?    150 Hz
2.   ?    1500 Hz
3.   ?    150 000 000 Hz
4.   ?    150 000 000 000 Hz

What kind of signals do we hear or see?

1.   ?    Digital only
2.   ?    Analogue only
3.   ?    Both analogue and digital
4.   ?    Neither of these