The birth of a star (AQA A-Level Physics): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What is the temperature range of molecular clouds where stars form?
What is the temperature range of molecular clouds where stars form?
10 to 50 K
What percentage of molecular cloud material consists of dust particles?
What percentage of molecular cloud material consists of dust particles?
Approximately 1%
What is the energy source for radiation emitted by protostars before fusion begins?
What is the energy source for radiation emitted by protostars before fusion begins?
Gravitational potential energy
In which part of the electromagnetic spectrum do protostars initially emit radiation?
In which part of the electromagnetic spectrum do protostars initially emit radiation?
Infrared
What two forces balance in a main-sequence star to maintain equilibrium?
What two forces balance in a main-sequence star to maintain equilibrium?
Gravity inward & gas pressure outward
Above what core temperature does hydrogen burning use the CNO cycle instead of p-p chain?
Above what core temperature does hydrogen burning use the CNO cycle instead of p-p chain?
K
What role does carbon play in the CNO cycle?
What role does carbon play in the CNO cycle?
Acts as a catalyst
What is the net result of hydrogen burning in main-sequence stars?
What is the net result of hydrogen burning in main-sequence stars?
Four protons form one helium nucleus
How long can photons take to escape from a star's core to its surface?
How long can photons take to escape from a star's core to its surface?
Tens of thousands of years
What is the circumstellar disc that forms around a protostar?
What is the circumstellar disc that forms around a protostar?
Rotating flat disc where planets may form