This question is about electromagnetic waves and the Universe.
State one similarity and one difference between Ultraviolet (UV) radiation and Radio waves.
Similarity: _________________________________
Difference: _________________________________
The following graph shows how the absorption of X-ray radiation changes with the thickness of lead shielding.
What percentage of X-ray radiation is absorbed by 1.5 mm1.5\text{ mm}1.5 mm of lead?
Percentage absorbed = ________ %
Calculate the percentage of X-ray radiation passing through 1.5 mm1.5\text{ mm}1.5 mm of lead.
Percentage passing through = ________ %
Use words from the following list to complete the sentences about stars and the Universe. Each word may be used once, more than once, or not at all.
Big Bang** | CMBR | Expanding | Main sequence | Red shift | Supernova | **Neutron star
- The scientific theory describing the origin of the Universe from an extremely hot, dense point is called the __________________ theory.
- At the end of its life cycle, a star of much greater mass than the Sun will collapse and explode in a brilliant explosion called a __________________.
- Observations showing that light from distant galaxies has been stretched to longer wavelengths suggest that the Universe is __________________.