a,b, c,c, a, b, c, a , d b
,a pencil being sharpened,exploding dynamite,and freezing water,
answer : to provide heat.
infrared waves are the waves having wavelength 700 nm to 1 mm.
the most common use of infrared waves is "to provide heat" i.e. in heat-sensitive thermal imaging cameras. it is a invisible wave. it can only sensed by a sensation of warmth.
for example :
when an object is hot, it will emit energy in the form of infrared waves.
so, correct option is (b)
the answer is 46 mls because when you add the speed per second it increses the speed