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Physics
A Level

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 ...

SJ
Answered by Sebastian J. • Physics tutor
7733 Views

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 ...

SP
Answered by Srijan P. • Physics tutor
6818 Views

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 e...

DS
Answered by Dan S. • Physics tutor
7240 Views

Calculate the frequency of a simple pendulum of length 950 mm. Give answer to an appropriate number of significant figures.

Firstly, we remember that frequency is the reciprocal of the time period. The formula for the time period of a simple pendulum is T=2π*sqrt(l/g) 

Secondly,

TS
Answered by Theodore S. • Physics tutor
6282 Views

Is Pluto a planet?

Pluto is officially no longer classed as a planet, and here's why. The International Astronomical Union defined three rules in 2005 that a celestial body (an object observable within space) must follow...

CG
Answered by Connor G. • Physics tutor
3598 Views

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