To detect details of the size a nanoparticle (i. e. a particle about 15nm) with electromagnetic radiation, you must use an electromagnetic wave with wavelength smaller (up to ten times) than the nanoparticle.

(a) For a wavelength three times smaller than the nanoparticle, what is the frequency of the electromagnetic wave required?
(b) What type of electromagnetic radiation does this frequency correspond to?

c because the news are a source of information of things that happen on the daily and shows evidence about that particular topic

conservation of mass

mass before something happens = mass afterwards

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.

in most common fires, oxygen is needed for an oxidation reaction to takes place. the combination of oxygen with any element as fuel can create fire and combustion will occur especially if wood, light materials and other combustible things are combine with oxygen.