iGCSE Physics (0625) 6.2.2 Stars-Exam Style Questions- New Syllabus
▶️ Answer/Explanation
Detailed solution:
The Sun is a medium-sized star located within a vast collection of billions of stars known as a galaxy.
According to the syllabus, our solar system resides in the galaxy specifically named the Milky Way.
The Milky Way is a spiral galaxy with a diameter of approximately $100000$ light-years.
While Andromeda is a neighboring galaxy, and the Universe contains all existing matter, they do not name our specific home galaxy.
Redshift is a phenomenon used as evidence for the expansion of the Universe, not a name for a galaxy.
Therefore, the correct answer is the Milky Way, as identified in Option B.
▶️ Answer/Explanation
Detailed solution:
The Milky Way is classified as a galaxy, which is a massive system consisting of gas, dust, and billions of stars.
Our Solar System is merely a small part of the Milky Way, not the other way around as suggested in option B.
While we see many stars from the Milky Way in the night sky, we cannot see all of its billions of stars with the naked eye.
A comet’s path is a local orbital trajectory within the Solar System and is unrelated to the definition of a galaxy.
The diameter of the Milky Way is approximately $100000$ light-years, and it contains our Sun as one of its many stars.
Therefore, statement A is the only scientifically accurate description of the Milky Way’s nature.
Question
The nuclide notation of the isotope strontium-90 is \(_{38}^{98}\textrm{Sr}\). Which statement is correct?
A A nucleus of strontium-90 has 38 neutrons.
B A nucleus of strontium-90 has 52 neutrons.
C A nucleus of strontium-90 has 90 electrons.
D A nucleus of strontium-90 has 90 neutrons.
▶️Answer/Explanation
Ans B