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What is the Doppler Effect?

The Doppler Effect is the strectching and compressing of waves caused by the movement of the source. Put more simply, when an object emits a sound - say a van beeping its horn it produces a sound of a certai...
SJ
Answered by Sebastian J. • Physics tutor
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How do I solve this problem?

Two trains move towards one another. The first one has a speed of 30 km/h , and the second one travels at 50 km/h . The initial distance between them is 160 km and they both begin to move at the same time. A...
II
Answered by Ioan I. • Physics tutor
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What are the postulates of special relativity?

There are two postulates of special relativity: 1. The laws of physics are invariant in all inertial frames of reference. What this means is that if we have a description for how physical systems undergo cha...
SP
Answered by Srijan P. • Physics tutor
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Explain the workings of a mass spectrometer

Charged particles are fired into a magnetic field (perpendicular to the motion of the particles). Using Fleming’s left hand rule, a magnetic force acts centripetally – such that the charged particles exhibit...
DS
Answered by Dan S. • Physics tutor
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How deep is the water if it takes a pulse of ultrasound 0.8s to be received back at the boat. the speed of ultrasound is 1600m/s in water

firstly we know how fast the wave is travelling and we know for how long so using our speed equals distance over time equation we can rearange for distance (D= VT). we can the plug in our speed(V) and our ti...
RC
Answered by Ross C. • Physics tutor
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