CAIE IGCSE Physics Current Hubble Constant Estimate

Practise recalling the current syllabus estimate for the Hubble constant and give its reciprocal-time unit correctly in standard form.

Exam points

state the current estimate H_0 = 2.2 × 10^-18 s^-1, equivalently 2.2 × 10^-18 per second

[Maximum number: 1]

A galaxy is approximately $1.2 \times 10^{26} \mathrm{~m}$ from the Earth.

State the current estimate for the Hubble constant $H_{0}$ .

H_{0}=

( $H_{0}=$ ) $2.2 \times 10^{-18}$ per second

B1

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