The paper 2 deck OMG Flashcards
What does the wavelength and intensity of infrared radiation depend on
The temperature of the object a hotter object will create a shorter wavelength and have a higher intensity.
What does a perfect black body do to radiation
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
What does an object that absorbs radiation well also do
It will also emit radiation well
What will it object to if it is warmer than its surroundings
It will emit more radiation that it absorbs, decreasing its temperature. The Reverse is also true
what does it Mean if an object is at a constant temperature
It means the object is absorbing radiation at the same rate as it is emitting radiation
Cloud cover can affect how much energy is radius from the Earth explain why
The clouds can reflect infrared light back to the Earth and then prevent it from being radiated into space
What is specular reflection
When all the light rays reflect in the same direction on a smooth surface producing an image
What is diffuse reflection
When light rays but have scattered after reflecting off of a rough surface which does not produce an image
What are all the colours in the spectrum of visible light
Red orange yellow green blue Indigo Violet
How do coloured filters work
They walk by absorbing specific wavelength and transmitting other wavelengths
Why can a direct current not work in transformers
They produce a constant magnetic field and therefore it does not work in transformers
What colour will the green object appear if any coloured filter is used on light and at least one colour goes through
It will appear black unless the colour is shining through a green filter.
What do transformers only work with
Transformers only worked with alternating-current this because we need a changing magnetic field to induce a potential difference
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
Yes
What happened to the potential difference in a primary coil if the secondary coil has double its turns
The potential difference is doubled- therefore this is a step up transformer
What are the four magnetic metals
Iron steel cobalt and nickel