Robert Bunsen discovered that heating elements in a flame of his famous burner generated colorful flames. Each element or compound created different bands of color when he passed the light from the flame through a prism. Scientists use the same techniques today to research elements and compounds. If the measured wavelength of a light wave is 6.20 x10-7 meters, what is the frequency of the light? 3.00x108 Hz
3.00x10, 8, Hz

4.84x1014 Hz
4.84x10, 14, Hz

2.07x10-15 Hz
2.07x10, -15, Hz

1.86x102 Hz

the answer is 1 i believe

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.      

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.