Waves

Identify the parts of the wave shown in the image.

a

b

c

Compression

Frequency

Amplitude

Wavelength

Rarefaction

What type of wave is a sound wave?

• electromagnetic

• longitudinal

• transverse

A student bangs 2 bricks together, the sound reflected off the wall. Reorder the steps needed to determine the speed of the sound

• Measure the time taken from banging the bricks to the echo

• Measure the distance between the student with the bricks and the wall

• Double the measured distance to give the distance travelled or half the time

• use: speed = distance / travelled time to calculate speed

Which letter shows the position of the ultraviolet (UV) radiation within the electromagnetic spectrum?

• P

• Q

• R

• S

UV radiation is used to treat a vitamin D deficiency. People should not use a UV lamp for long periods of time.

Which of these is not a risk factor.

• Sunburn

• Skin damage

• Increased risk of skin cancer

• Damage to the eyes

• Increased risk of lung cancer

A special lamp can produce UV radiation.

Which two statements describe the electromagnetic waves emitted by a UV lamp?

Tick two boxes.

• They have a higher frequency than X-rays.

• They have the same wave speed as visible light.

• They have a longer wavelength than microwaves.

• They have a lower frequency than gamma rays.

• They have a greater wave speed than radio waves.

Ionising radiation is used for some medical imaging. Name two types of electromagnetic waves that are used.

• Gamma Rays

• Ultra Violet

• Alpha Radiation

• Beta Radiation

• Electricity

In a vacuum, all electromagnetic waves travel at the same ​ (a)   . Gamma waves have the greatest ​ (b)   . Radio waves have the greatest ​ (c)  

• velocity
• frequency
• wavelength
• mass
• power

Explain why it is important that the Earth’s atmosphere absorbs gamma rays emitted by the Sun.

• So people are not exposed to (as much) gamma radiation

• Because gamma radiation can damage human tissue

• To stop the atmosphere heating up

• Gamma rays can cause nuclear explosions

Not all microwaves are absorbed by the atmosphere. This is useful because they can be used ​ (a)  

• in communication
• to cook food
• for skin tanning
• to shrink objects