JaKe HoSfOrD

Conclusion to convection currents experiment

i found in the heat convection test the purple stain rose in a circular form like a tornado

i found in the cold convection test that the purple stain decended to the bottom in a spread out formation a bit like a cyclone

Journal Entry Week 3

1. Analyse why red sunsets can sometimes be more impressive when there is more dust or pollution in the air than usual.

 They are more impresive when there is no dust or pollution in the air because the light rays refracts and can discolour the light off the pollution and dust particles which prevents the full effect of the sunset.

1. Describe what happens inside water droplets to cause a rainbow and explain how you can tell whether a rainbow is a primary or secondary.

the white light goes through the falling water droplets then it  reflects and refracts to cause the spectrum to appear.

You can tell if a rainbow is primary or secondary by the colours they are in from top to bottom. A primary rainbow will have red on top and a secondary rainbow will have violet on top.

            JOURNAL ENTRY WEEK 2

Investigate the two types of sight defect- long-sightedness and short sightedness.

Find the following information:

1. what causes the defect

 the eyeball is too long compared with the focusing power of the cornea and lens. This means light rays from objects in the distance are focused in front of the retina because they’ve been bent too much by the cornea and lens.

Long-sightedness (hypermetropia)

the eyeball is too short when compared with the focusing power of the cornea and lens. This means light rays from near objects are focused behind the retina because they haven’t been bent enough by the cornea and lens.

1. the symptoms displayed

Short-sighted:  Objects in the distance appear blurry

Long-sighted: Headache, eye strain, blurry vision when concerntrating on close objects

1. propose what sort of lens may be used to correct each vision.

Long-sighted: Convex lenses

Short sighted: Concave lenses

THE BIG BANG:

What contribution did the following scientists make towards the big bang theory?

-         Walter Adams.

He worked on solar spectroscopy and co-discovered a relationship between the relative intensities of certain spectral lines and the absolute magnitude of a star. He was able to demonstrate that spectra could be used to determine whether a star was a giant or a dwarf.

Ralph Alpher.

if the universe started with a big bang, as others had hypothesized, it would explain the varying abundances of elements in the universe.

-         Robert Dicke.

pioneers of the Big Bang Theory, announced they had detected an unexpected and relatively high level of radiation, Dicke proposed that this was cosmic radiation left over from the Big Bang.

-         What was Hubble’s involvement in space research?

Hubble studied the position of dark lines within the spectrum of light emmitted by a star or galaxy and studied the speed they were travelling

-         What does the telescope do?

provides unprecedented deep and clear views of the Universe, ranging from our own solar system to extremely remote fledgling galaxies forming not long after the Big Bang 13.7 billion years ago. 

-         Where can the telescope be found?

The telescope can be found in space thravelling at 5 miles per second, taking 97 minutes for one complete orbit around the world.      

What is Hubble’s law?

Distant stars and galaxies are receeding from us, and the further away they are the faster they are travelling.