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Instruction: Read each question and write out complete workings and diagrams in your answer booklet. Use the checkbox below each question to track your attempted responses.
Question 1
3 Marks
Official WAEC Scoring Rubric & Marking Scheme
Standard Physical Constants
Constant
Symbol
Value
Acceleration due to gravity
$g$
$10\text{ m s}^{-2}$
Speed of light in vacuum
$c$
$3.0 \times 10^8\text{ m s}^{-1}$
Planck's constant
$h$
$6.63 \times 10^{-34}\text{ J s}$
Electronic charge
$e$
$1.60 \times 10^{-19}\text{ C}$
Mass of an electron
$m_e$
$9.1 \times 10^{-31}\text{ kg}$
Specific heat capacity of water
$c_w$
$4200\text{ J kg}^{-1}\text{ K}^{-1}$
Specific latent heat of steam
$L_v$
$2.26 \times 10^6\text{ J kg}^{-1}$
Universal gravitational constant
$G$
$6.67 \times 10^{-11}\text{ N m}^2\text{ kg}^{-2}$