Waves in communication

On a slinky spring, _________________ refers to where the coils are packed together.

• Rarefactions

• Compressions

• Condensation

• Refractions

The direction in which the wave is travelling is referred to as _________________.

• forwards

• Longitudinal

• Propagation

• Oscillations

Light is made up of _________________ waves that oscillate at different angles relative to the direction of ____________________________

• transverse, production

• Longitudinal, propagation

• transverse, propagation

• coloured, spectrum

On a slinky spring, _________________ refers to where the coils are further apart.

• Refraction

• Compressions

• Rarefactions

• Diffraction

A wave generator with a frequency of 50 Hz produces water waves with a wavelength of 20cm.

V= freq x wavelength

• 10 m/s

• 25 m/s

• 100 m/s

• 2500 m/s

The wavelength of a wave travelling at 11km/s with a frequency of 5.5kHz.

v = fλ

• 10m

• 24m

• 2m

• 4m

Vibrations that travel through a substance (medium).

• Electromagnetic waves

• Transverse waves

• Mechanical waves

• Longitudinal waves

_________________ are perpendicular to the direction the waves travels

• Electromagnetic waves

• Longitudinal waves

• Mechanical waves

• Transverse waves

A light emits visible light. What is the intensity 2m from the source.

I = k/r²

• 0.5

• 0.45

• 0.25

• 0.6

A mobile phone emits a microwave.

At what distance is the intensity 7.5. ( k=3)

I = k/r²

• 0.48

• 0.63

• 0.75

• 0.54