33 ms = 33 x 10^{-3}s = 0.033 s

So, the duty cycle is (0.033 s÷T s) x 100% = 3%

(what is the value of T)

Transposing the formula gives T s = insert your workings here =

= Ans A s

= Ans B ms

1 hour = 60min x 60 s = 3 600 s

So, in 1 hour the node transmits,

3 600s = Ans C times

Ans A s

Therefore, node transmits for

0.033 s x Ans C =

= Solution (3 s.f.) in every hour