Astronomers at the European Southern Observatory in Chile observe light from a distant galaxy. The absorption lines in the spectrum are shifted towards longer wavelengths compared to a laboratory reference spectrum.

What can be concluded from this observation?

Q: How do I try a free CIE Physics question?

Just tap any of the four options on this page — no signup, no card, nothing to install. You'll see the correct answer and a full mark-scheme-style explanation within a second. Each visit shows a fresh randomly-picked question from the live CIE IGCSE Physics bank, so you can keep refreshing to try different ones before deciding whether to create a free account for daily access.

Q: Is Kramizo really free for CIE Physics students?

Yes — completely free. Every student gets 45 questions a day on the free plan, across any board and any subject, with no card required and no trial countdown. Kramizo's optional Pro plan removes the daily cap and adds analytics, but the free plan is genuinely free forever. We make money from the small percentage of students who choose to upgrade — not from selling data or ads.

Q: Are the Physics questions aligned to the CIE IGCSE syllabus?

Every question is written against the published CIE IGCSE Physics syllabus and reviewed for accuracy before being added to the bank. We match the command words (state, describe, explain, evaluate), mark allocations, and difficulty tier you'll see on real CIE past papers. Explanations are written in the style of official examiner mark schemes so students learn exactly what marks are being awarded for.

Question

Astronomers at the European Southern Observatory in Chile observe light from a distant galaxy. The absorption lines in the spectrum are shifted towards longer wavelengths compared to a laboratory reference spectrum.

What can be concluded from this observation?

Accepted Answer

The galaxy is moving away from Earth — Award 1 mark for stating that a shift towards longer wavelengths (red-shift) indicates the galaxy is moving away from Earth. A is incorrect — movement towards Earth would produce blue-shift (shorter wavelengths). C is incorrect — a stationary source would show no shift. D is incorrect — rotation would cause both red and blue shifts in different parts of the galaxy's spectrum.

Answer

The galaxy is moving away from Earth

Answer

The galaxy is rotating on its axis

Answer

The galaxy is moving towards Earth

Answer

The galaxy is stationary relative to Earth

One real Physics question.No signup. 30 seconds.

One real Physics question.
No signup. 30 seconds.