Waves
What word is used to describe travel of waves?
Propagate
Where do waves propagate faster, shallow or Deep water?
Deep
Which EM wave is used for tanning?
UV
What is the unit of Activity?
Becquerels (Bq)
Which EM wave is considered safe
Radio waves
Where would sound travel fastest?
Solids
what is" Number of waves per second"?
Frequency
What happens during excitation of an electron?
Electron absorbs Energy and moves to a higher level
Give a Physics term describing this statement:
"This is often due to a radiation leak"
Contamination
What is nano?
10-9
Whats the difference between transverse and longitudinal waves?
one perp. and the other parallel. oscillation to wave direction
What instrument is used to measure long distances?
Trundle Wheel
Give Two uses of UV light
tanning - detect forged bank notes - Sterilization and Disinfection
How to calculate the corrected count rate?
Count rate from sample - Background
Convert 2 hrs to seconds
7200 seconds
What formula is used to find find wave speed?
v = frequency x wavelength
What is the fourth colour in the visible light?
Green
What are the 7 EM waves starting from the highest frequency
Gamma - X - UV- VL- IR - M -R
name of the device used by medical professionals to monitor exposure rate to radiations
Dosimeter
What is the speed of sound in air?
343 m/s
What is the speed of EM waves in vacuum?
3x108 m/s
what wave behaviour is used by bats to communicate in caves
Reflection
list one use for each of the 7 EM waves
broadcasting - satelite communication - heaters - photography - detect forged bank notes - detect fractured bones - cancer treatment
Give 2 natural and 2 non natural sources of background radiation
Cosmic - rocks - food - hospitals - nuclear waste - nuclear tests
In what years did England most recently reach the semi-finals of the FIFA World Cup?
1990 and 2018