P3.1.1 - Your Phone (Analogue/Digital and EM Spectrum) Flashcards
What is meant by an analogue signal?
A signal that can have a range of possible values.
Which type of signal does the image show?
Analogue signal
What does the microphone of a mobile phone do?
It converts sound into an electrical signal
What does a mobile phone do with the analogue electrical signal that is made by the microphone?
It converts the analogue signal into a digital signal.
What is a digital signal?
A signal that can only have 2 possible values “1” or “0”
The “1” or “0” that make up a digital signal are called…
Binary numbers
When a person receives a call what does their phone do with the digital signal that is received?
The phone converts the signal back into an analogue signal.
The speaker converts the analogue signal into sound.
Which type of signal does the diagram show?
Digital signal
The binary numbers “1” or “0” are sometimes called…
Binary digits OR Bits
What is “bit” short for?
Binary Digit
How many “bits” are in a “byte”?
8
How many “bytes” are in 1 Kilobyte?
1000
How many bytes are in a megabyte?
1 million
How are bits stored on phones or laptops?
Small pieces of magnetised material:
N-S = 0
S-N = 1
What is the electromagnetic spectrum?
The range of wavelengths and frequences that electromagnetic radiation can have
What is electromagnetic radiation?
The movement of energy as electrical and magnetic waves.
What is the order of the electromagnetic spectrum?
Radio waves
Micro waves
Infra Red
Visible Light
Ultraviolet Light
X rays
Gamma Rays
Waht are radiowaves used for?
TV and Radio Signals
What are microwaves used for?
Mobile phone signals
Cooking food
Wifi/Bluetooth
What is infra red radiation used for?
Cooking
Heaters
Optical fibres
What is visible light used for?
Optical fibres
Sight
What is ultra violet radiaiton used for?
Tanning beds
Security ink
What are X rays used for?
Seeing broken bones
What are gamma rays used for?
Sterilising medical equipment/food
Treating cancer
What does the green line show?
The amplitude of the wave
What does the red line show?
The wavelength of the wave.
