P3.1.1 - Your Phone (Analogue/Digital and EM Spectrum) Flashcards

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1
Q

What is meant by an analogue signal?

A

A signal that can have a range of possible values.

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2
Q

Which type of signal does the image show?

A

Analogue signal

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3
Q

What does the microphone of a mobile phone do?

A

It converts sound into an electrical signal

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4
Q

What does a mobile phone do with the analogue electrical signal that is made by the microphone?

A

It converts the analogue signal into a digital signal.

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5
Q

What is a digital signal?

A

A signal that can only have 2 possible values “1” or “0”

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6
Q

The “1” or “0” that make up a digital signal are called…

A

Binary numbers

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7
Q

When a person receives a call what does their phone do with the digital signal that is received?

A

The phone converts the signal back into an analogue signal.

The speaker converts the analogue signal into sound.

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8
Q

Which type of signal does the diagram show?

A

Digital signal

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9
Q

The binary numbers “1” or “0” are sometimes called…

A

Binary digits OR Bits

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10
Q

What is “bit” short for?

A

Binary Digit

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11
Q

How many “bits” are in a “byte”?

A

8

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12
Q

How many “bytes” are in 1 Kilobyte?

A

1000

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13
Q

How many bytes are in a megabyte?

A

1 million

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14
Q

How are bits stored on phones or laptops?

A

Small pieces of magnetised material:

N-S = 0

S-N = 1

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15
Q

What is the electromagnetic spectrum?

A

The range of wavelengths and frequences that electromagnetic radiation can have

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16
Q

What is electromagnetic radiation?

A

The movement of energy as electrical and magnetic waves.

17
Q

What is the order of the electromagnetic spectrum?

A

Radio waves

Micro waves

Infra Red

Visible Light

Ultraviolet Light

X rays

Gamma Rays

18
Q

Waht are radiowaves used for?

A

TV and Radio Signals

19
Q

What are microwaves used for?

A

Mobile phone signals

Cooking food

Wifi/Bluetooth

20
Q

What is infra red radiation used for?

A

Cooking

Heaters

Optical fibres

21
Q

What is visible light used for?

A

Optical fibres

Sight

22
Q

What is ultra violet radiaiton used for?

A

Tanning beds

Security ink

23
Q

What are X rays used for?

A

Seeing broken bones

24
Q

What are gamma rays used for?

A

Sterilising medical equipment/food

Treating cancer

25
Q

What does the green line show?

A

The amplitude of the wave

26
Q

What does the red line show?

A

The wavelength of the wave.