The paper 2 deck OMG Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

What does the wavelength and intensity of infrared radiation depend on

A

The temperature of the object a hotter object will create a shorter wavelength and have a higher intensity.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What does a perfect black body do to radiation

A

It absorbs all of it no radiation is reflected and no radiation is transmitted (passed through)
This means that a perfect black body is also the best possible emitter of radiation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What does an object that absorbs radiation well also do

A

It will also emit radiation well

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What will it object to if it is warmer than its surroundings

A

It will emit more radiation that it absorbs, decreasing its temperature. The Reverse is also true

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what does it Mean if an object is at a constant temperature

A

It means the object is absorbing radiation at the same rate as it is emitting radiation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Cloud cover can affect how much energy is radius from the Earth explain why

A

The clouds can reflect infrared light back to the Earth and then prevent it from being radiated into space

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is specular reflection

A

When all the light rays reflect in the same direction on a smooth surface producing an image

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is diffuse reflection

A

When light rays but have scattered after reflecting off of a rough surface which does not produce an image

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What are all the colours in the spectrum of visible light

A

Red orange yellow green blue Indigo Violet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

How do coloured filters work

A

They walk by absorbing specific wavelength and transmitting other wavelengths

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Why can a direct current not work in transformers

A

They produce a constant magnetic field and therefore it does not work in transformers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What colour will the green object appear if any coloured filter is used on light and at least one colour goes through

A

It will appear black unless the colour is shining through a green filter.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What do transformers only work with

A

Transformers only worked with alternating-current this because we need a changing magnetic field to induce a potential difference

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Is the potential difference in the primary coil the same as in the secondary coil if the secondary coil has the same number of turns

A

Yes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What happened to the potential difference in a primary coil if the secondary coil has double its turns

A

The potential difference is doubled- therefore this is a step up transformer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What are the four magnetic metals

A

Iron steel cobalt and nickel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

How do you plot the magnetic field of a bar magnet using a compass

A

You place the south end of the compass next to the north end of the bar magnet and place An x onto where the North Pole is pointing to then repeat this with the South Pole on this point and plot across where the North Pole arrow is pointing now and connect all the points with a line.

16
Q

What is a solenoid

A

A solenoid consists of a wire coiled up into a spiral shape.

17
Q

What is an electromagnet

A

An electromagnet is a solenoid wrapped around an iron core

18
Q

How do we turn high voltage appliances on and off

A

We use a relay

19
Q

What is a relay

A

A relay is a low voltage circuit using an electromagnet that is turned on and off using switch controlling a high voltage circuit using Magnetism to attract an iron block which puts two contacts on top of each other and allows current to flow through the high voltage circuit

20
Q

What is the motor effect

A

A wire carrying a current creates a magnetic field. This can interact with another magnetic field, causing a force that pushes the wire at right angles. This is called the motor effect

21
Q

What does a split ring commutator do to a circuit

A

It rotates it

22
Q

What happens if we move a wire up through a magnetic field.- this is the generator effect

A

Is there a potential difference is induced across the ends of the wire same goes for current.
The induced potential difference in current are larger if we use a stronger magnetic field we move the wire more rapidly and if we shape the wire into a coil the more turns on the coil the greater the induced pot diff and current

23
Q

How does a moving coil loudspeaker work

A

First we have a cone which has a coil of wire wrapped around one end which is connected to an AC electrical supply. We also have a permanent magnet which goes through the coil of wire. As the current passes through the coil it generates a magnetic field. The magnetic field from the coil now interacts with the magnetic field from the permanent magnet. These magnetic fields either attract or repel each other. This produces a resultant force which causes the cone to move.
When the current switches direction the direction of the force of the cone reverses. This causes the cone to move in and out generating sound waves. By changing the frequency of the AC supply we can change the frequency that the cone vibrates. A high frequency produces a high-pitched sound and the reverse is also true. If we increase the size of the current then we increase the amplitude of the vibration. This increases the volume of the sound.

24
Q

What happens to the current the direction of movement changes

A

The direction of the current changes, this also occurs if we switch the polls of a magnet going into the solenoid

25
Q

What is an alternator

A

A coil of wire rotating and a magnetic field

26
Q

When is the maximum potential difference of an alternator

A

When it is horizontally inside the magnetic field

27
Q

How do moving coil microphones work

A

In a moving-coil microphone:
pressure variations in sound waves cause the flexible diaphragm to vibrate
the vibrations of the diaphragm cause vibrations in the coil
the coil moves relative to a permanent magnet, so a
potential difference
is induced in the coil
the coil is part of a complete circuit, so the induced potential difference causes a current to flow around the circuit
the changing size and direction of the induced current matches the vibrations of the coil
the electrical signals generated match the pressure variations in the sound waves
https://www.bbc.co.uk/bitesize/guides/z8c7pbk/revision/4

28
Q

What is a galaxy

A

A large group of stars and a nice chocolate bar

29
Q

How are stars formed

A

All stars begin life in the same way. A cloud of dust and gas, also known as a
nebula
, becomes a protostar, which goes on to become a
main sequence
star. Following this, stars develop in different ways depending on their size.
Stars that are a similar size to the Sun follow the path:
red giant star
white dwarf
black dwarf
Stars that are far greater in mass than the Sun follow the path:
red super giant star
supernova
neutron star, or a black hole (depending on size)

30
Q
A
31
Q
A
32
Q
A
33
Q
A
34
Q
A
35
Q
A
36
Q
A
37
Q
A
38
Q
A
38
Q
A