[1 mark/markah]
(f) explain the effect on human being if exposed to radioactive ray for longer period.
terangkan kesan terhadap manusia jika terdedah kepada sinaran radioaktif untuk jangka masa yang
panjang?
[2 marks/markah)

Which is not true of the intertropical convergence zone? a) it features heavy precipitation b) it's where the trade winds collidec) it's a high-pressure zone with sinking air d) it is also known as the doldrums

Which statements best describe medical uses for radioactive isotopes? check all that apply. radioactive isotopes are used to detect medical problems. high-energy gamma rays are injected into the body. radioactive isotopes are used to treat some diseases. radiation is used to kill cancer cells. radioactive isotopes are directed at tumors from outside the body.

Which color of light has a longer wavelength than yellow? a. red b. blue c. green d. violet