During the twentieth century red-shift and CMB radiation
were discovered.
They have provided
scientists with data to test theories of the origin of the Universe.
Complete the
following sentence.
CMB is an abbreviation for
............................................................................................................
_
State which theory about the origin of the Universe is
supported by the
existence of CMB.
_
There is a red-shift in the light received from some
galaxies.
State what is meant
by red-shift
_
Some galaxies show greater red-shift than others.
Explain what this
suggests about the Universe.
_
Modern telescopes can provide us with more data than the
telescopes used
100 years ago.
Explain what
additional data can be collected and processed using modern
telescopes.
_
Some students investigate the efficiency of electric motors.
The students find
that one electric motor has an efficiency of 60%.
Explain in terms of
energy what is meant by an efficiency of 60%.
_
Many earthquakes and volcanoes are linked to the production
of infrasound
waves.
Describe what is meant
by infrasound waves.
_
The electromagnetic spectrum is continuous.
Different regions of
the spectrum have different properties.
Name an electromagnetic wave that is also an ionising
radiation.
_
Genuine banknotes contain a special ink.
This ink is invisible
under normal light.
Suggest why the ink
glows when ultraviolet radiation is shone on it.
_
An electromagnetic wave has a frequency of 7 × 109 Hz.
The speed of the wave
is 3 × 108 m/s.
Calculate the
wavelength of the wave.
_
Radiation from different regions of the electromagnetic
spectrum can affect the
human body in many ways.
Discuss the different
ways in which excessive exposure to electromagnetic
radiations of various frequencies may cause damage to the
human body.
_
What is the name of the device used to change the size of an
alternating voltage?
_
A LED lamp has a power rating of 3 W.
The voltage across
the lamp is 12 V.
Calculate the current
in the lamp.
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Source:
http://i2.kym-cdn.com/photos/images/original/000/075/499/pressure.jpg
http://pastpapers.edexcel.com/content/dam/pdf/GCSE/Science/2011/Question%20papers%20and%20mark%20schemes/5PH1H_01_que_20130605.pdf
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