Question
The graph shows the energy radiated by the Sun at different wavelengths. Most of the energy is radiated in just three parts of the electromagnetic spectrum, labelled \(P, Q\) and \(R\).
Which parts of the electromagnetic spectrum are \(\mathrm{P}\) and \(\mathrm{R}\) ?
▶️Answer/Explanation
Ans:D
Question
An astronomer observes redshift in the light from a distant galaxy.
Which statement about redshift is correct?
A It is the decrease in the observed wavelength of red light emitted from receding galaxies.
B It is evidence that the Universe is contracting and supports the Big Bang Theory.
C It is evidence that the Universe is expanding and supports the Big Bang Theory.
D Redshift is when light from receding galaxies appears blue.
▶️Answer/Explanation
Ans:C
Question
Which statement about the Solar System is correct?
A All the planets are rocky.
B Only the Earth has a moon.
C Pluto is a dwarf planet.
D There are many stars in the Solar System.
▶️Answer/Explanation
Ans:C