Answer:
(7)D.short
(8)D.ultraviolet
(9)C.Human ear
(10)C.Distance
Explanation to number 7:
If it is high frequency then the wavelength will be short beacuse it carries more frequency that can short the wavelenght of it
Explanation to number 9:
There are many soundwaves in the nature that human ear can always detect but some items/inventions that used to detect waves can only detect what can they hear from the surroundings
