RADIO WAVES

#1. A radio wave is:

• Aan energy wave comprising an electrical field in the same plane as a magnetic field
• Ban electrical field alternating with a magnetic field
• Can energy wave where there is an electrical field perpendicular to a magnetic field
• Dan energy field with an electrical component

#2. The speed of radio waves is:

• A300 km per second
• B300 million metres per second
• C162 nm per second
• D162 million nm per second

#3. The plane of polarisation of an electromagnetic wave is:

• Athe plane of the magnetic field
• Bthe plane of the electrical field
• Cthe plane of the electrical or magnetic field dependent on the plane of the aerial
• Dnone of the above