1. Quick 5
Ultrasound

2. What are the units of wavelength?Hz
m/s m 

3. What frequency is ultrasound?
20,000 kHz
20 Hz
20 kHz
2,000 Hz

4. Which is not a use of ultrasound?
Cleaning delicate devices, like watches
Scanning pregnant women
In sunbed lamps
Checking for cracks in pipes

5. Which word describes what happens as ultrasound passes into the womb?
Dispersion
Refraction
Reflection
Reflection and refraction

6. Why are X-rays not used for baby scans?
Too expensive
Too dangerous
Technology not advanced enough
Not widely available