Cosmology Homework 3
Q1. Visible light is part of a family of waves known as the electromagnetic spectrum. What
is the speed of waves in the electromagnetic spectrum?
(1)
Q2. The Diagram represents the electromagnetic spectrum in order of increasing
wavelength. Some of the radiations have not been named.
a) Name radiation P, Q and R.
(2)
b) Which radiation in the electromagnetic spectrum has the highest frequency?
(1)
c) Stars emit ultraviolet and infrared radiation. Name a detector for each of these two
radiations.
(2)
Q3. A team of astronomers observes a star 200 light years away.
a) State what is meant by the term “light year”.
b) Images of the star are taken with three different types of telescope as shown.
Telescope A
visible light
i)
ii)
iii)
Telescope B
infrared
(1)
Telescope C
X-ray
Explain why different types of telescope are used to detect signals from
space.
(2)
Place the telescopes in order of the increasing wavelength of the radiation
which they detect.
(1)
State a detector that could be used in telescope C.
(1)
Q4. Radio waves emitted by galaxies are detected and used to provide images of the
galaxies.
a) How does the wavelength of radio waves compare with the wavelength of light? (1)
b) Name a detector for radio waves.
(1)
c) Why are different kinds of telescope used to detect signals from space?
(1)
Q5. The diagram represents the electromagnetic spectrum. Some of the radiations have
not been named.
a) Name radiations P and Q.
(2)
b) Which radiation in the electromagnetic spectrum has the shortest wavelength? (1)
c) State one detector of X-rays.
(1)