Edexcel A-Level Physics A2 5.6.166 Distance By Standard Candles Questions

Review standard candles in Edexcel A-Level Physics through known-luminosity definitions, galaxy-distance methods and inverse-square reasoning.

Exam points

define a standard candle as an astronomical object with known luminosity
describe measuring intensity and using I = L/(4πd²) to find galaxy or star distance
assess how dust reducing observed intensity changes the calculated distance to a candle

[Maximum number: 3]

The astronomer Hertzsprung used parallax to determine the distances to some of the variable stars known as Cepheids.

Cepheids are a type of standard candle.

Describe how standard candles can be used to determine distances to stars.

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