P13 EM Waves Communications

Which electromagnetic wave has the longest wavelength?

• Gamma Wave

• Microwaves

• X Rays

• Radio Waves

Which EM waves are the most energetic?

• X Rays

• Radio Waves

• Gamma Waves

• Microwaves

Which EM waves can be used for communications?

• Radiowaves

• Microwaves

• UV Rays

• Visible light

• Infrared

Microwaves are used for mobile phone and other satellite communication because they are not reflected by the

Which word describes the process of giving out radiation?

• Emission

• Absorption

• Transmission

What is the correct equation for calculating wave speed?

• wave speed = frequency / wavelength

• wave speed = frequency x wavelength

• frequency = wave speed x wavelength

What is the spreading out of waves called?

• Reflection

• Refraction

• Deflection

• Diffraction

• Dispersion

What can fibre optics be used for?

• Christmas decorations

• Broadband

• Children's toys

• Medical uses (endoscope)

What type of current is created when radio waves are absorbed by a conductor?

Information is sent along optical fibres using ______ Satellite dishes on Earth use ______ to communicate with orbiting satellites. Mobile phones receive ______ signals.

• radiowave, microwave, infrared

• infrared, microwave, microwave

• infrared, radiowave, radiowave

• microwave, microwave, infrared