An electromagnetic wave traveling in a
vacuum has a frequency of 5 x 10 Hz,
Calculate the wavelength of this wave.
The speed of light in a vacuum is c.
a) 6,000,000m
b) om
c) 0.06m
d) 0.6m

the answer is b i think

more than, less

less than, more

conservation of mass

mass before something happens = mass afterwards

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.