National 4 Physics Waves Revision Flashcards
Is a sound wave longitudinal or transverse?
Longitudinal
Is a water wave longitudinal or transverse?
Transverse
The definition of frequency is:
The number of waves per second.
The unit of frequency is:
hertz (Hz)
What is wavelength?
The distance from one wave to the next.
What is amplitude?
The height of a wave from the middle to the top.
The unit of sound level is:
decibel (dB)
Why does an airport worker wear ear defenders?
To protect his hearing from loud sounds.
What is the danger level for sound?
80-90 dB
What is the risk of high sound levels?
They can damage hearing.
Fluorescent chemicals are detectors of:
Ultraviolet radiation.
Gamma rays can be detected with:
A Geiger-Muller tube
An aerial can detect:
Radio waves and Microwaves
How can Ultraviolet radiation harm humans?
Can cause skin cancer and damage eyesight.
How can X-rays harm humans?
Can cause cancer.
How can gamma rays harm humans?
Can cause cancer.
The sun is a source of which three types of radiation?
Infrared, Visible light, Ultraviolet.
A detector of infrared radiation is a:
Photodiode
A detector of X-rays is:
Photographic film.
A hot object is a source of:
Infrared radiation.
Which type of radiation is used in thermal imaging cameras?
Infrared.
Which type of radiation is used to detect security markings on bank notes?
Ultraviolet
Which type of radiation is used to detect broken bones?
X-rays
Describe an application (use) of Ultrasound.
To scan unborn babies.
