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science > Your ... > Flashcards

Your ... Flashcards

1
Q

A signal is made of…

A

1’s and 0’s

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2
Q

Analogue signals can have how many values?

A

A range

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3
Q

Digital signals can have how many values?

A

Vary between 2

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4
Q

The more efficient a device is..

A

The less energy wasted

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5
Q

Light bulb designs have changed to…

A

Save energy

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6
Q

We can’t have 100% efficient devices because there is…

A

Always wasteful energy

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7
Q

A sensor is?

A

A device which detects changes in its environment

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8
Q

Examples of a sensor

A

Thermometer
Light-dependent resistor (LDR)
Thermistor

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9
Q

Thermometer is quick to … but slow to …

A

Read

Cool down

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10
Q

Which ***** are on the electromagnet spectrum

A

Gamma rays
X-ray
MRI
Endoscopes

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11
Q

/\

A

Reflection

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12
Q

/’’””

A

At critical angle

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13
Q

/*

A

Away from normal

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14
Q

Reaction time is?

A

The time taken for a signal to get from your ears to your brain.

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15
Q

What’s more accurate a light gate or a stop watch

A

Light gate

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16
Q

Renewable energy is?

A

Energy that doesn’t run out

17
Q

What is the strongest waves in the electromagnet spectrum?

A

Gamma rays

18
Q

What is the second strongest waves in the electromagnet spectrum?

A

X - rays

19
Q

What is the third strongest waves in the electromagnet spectrum?

A

Ultraviolet (UV)

20
Q

What is the fourth strongest waves in the electromagnet spectrum?

A

Visible light

21
Q

What is the fifth strongest waves in the electromagnet spectrum?

A

Infared

22
Q

What is the sixth strongest waves in the electromagnet spectrum?

A

Microwaves

23
Q

What is the weakest waves in the electromagnet spectrum?

A

Radio waves

24
Q

Filament light bulbs give out more…

A

Heat

25
Q

Which light bulb is more efficient

A

LEDs

26
Q

What are four ways of generating energy?

A

Wind turbines
Hydroelectricity
Nuclear
Fossil fuel

27
Q

Efficiency tells you…?

A

The ratio of useful energy output to total energy input of a device.

28
Q

You can use a … in a circuit to detect temperature.

A

Thermistor

29
Q

Doctors use visible light in a device called … to see inside a patients body.

A

Endoscope

30
Q

When light hits the inside of the glass fibre bigger than the … angle, the light is…?

A

Critical

Reflected

31
Q

Doctors can use …, … and … to see inside the patient

A

Ultrasound
X rays
Endoscopes

32
Q

What is it called when the glass fibre is bigger than the critical angle and the light is reflected?

A

Internal reflection

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