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Alinara [238K]
2 years ago
12

A stainless steel knife has a volume of 1.2 cubic centimeters and a mass of 9.0 grams.

Chemistry
1 answer:
bija089 [108]2 years ago
5 0

Answer:

7.5

Explanation:

density = mass / volume

9÷1.2 = 7.5

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What is the energy of an electromagnetic wave with a frequency of 8 x 10^12
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Answer:

Energy, E=5.3\times 10^{-21}\ J

Explanation:

It is required to find the energy of an electromagnetic wave with a frequency of 8\times 10^{12}\ Hz. The energy of a wave in terms of its frequency is given by :

E=h\nu

\nu = frequency of em wave

E=6.63\times 10^{-34}\times 8\times 10^{12}\\\\E=5.3\times 10^{-21}\ J

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A crystal of potassium permanganate is placed in a beaker of water. The purple colour of potassium permanganate gradually spread
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