Skip to content

Course home

Sign up

Physical quantities and units

EasyMedium
1234567891011121314151617
Question 10
85%

According to the Stefan-Boltzmann law, the total power P P\,P emitted per unit surface area of a black body is directly proportional to the fourth power of its absolute temperature TTT. This is expressed by the equation:

P=σAT4 P = \sigma A T^4 P=σAT4

where A A\,A is the surface area and σ \sigma\,σ is the Stefan-Boltzmann constant. What are the SI base units of σ\sigmaσ?

A

kg s−3K−4\text{kg s}^{-3}\text{K}^{-4}kg s−3K−4

B

kg m2s−3K−4\text{kg m}^2\text{s}^{-3}\text{K}^{-4}kg m2s−3K−4

C

kg s−2K−4\text{kg s}^{-2}\text{K}^{-4}kg s−2K−4

D

kg m s−3K−4\text{kg m s}^{-3}\text{K}^{-4}kg m s−3K−4

Markscheme

Physical quantities and units Questions

  1. A Level
  2. /Physics
  3. /Physical quantities and units

29 exam-style questions on OCR A A Level Physics Physical quantities and units, covering Physical quantities and S.I. units. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank