Telecoms S4 Science

Waves transfer ...

Which is the transverse wave and which is the longitudinal wave?

a

b

Longitudinal

Transverse

Which statements represent ADVANTAGES of mobile phones?

• Sometimes they lose their signal and can't be used

• They don't need wires to make phone calls or send messages

• The battery can run out and they need recharged

• They can be used to access applications (apps)

• A mobile phone contract is more expensive than a landline

The earpiece of a phone handset contains a ​

• loudspeaker

• microphone

The mouthpiece of a phone handset contains a ​

• loudspeaker

• microphone

A loudspeaker converts electrical energy to what type of energy?

A microphone converts (a)   energy to ​ (b)   energy

• sound

• electrical

Optical fibres are long, thin pieces of

The speed of light in air is

• 200 000 000 meters per second

• 300 000 000 meters per second

The speed of electricity in a wire is

• 200 000 000 metres per second

• 300 000 000 metres per second