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3 years ago

Ultraviolet radiation has a frequency of 6.8×1015 Hz. What is the energy associated with this frequency?

1 answer:

5 0

Use Planck's equation (E=hv) to solve. where frequency (v) of ultrviolet radiation is 6.8 × 1015 1/s. The variable h is a constant equal to 6.63 × 10-34 J·s
E= (6.8 × 1015 1/s)x(6.63 × 10-34 J·s)

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Major Battles of the

san4es73 [151]

Answer: Lexington and Concord

Explanation: The British were trying to find weapons and could not find them.

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3 years ago

What is the mass of KOH found in a 785 mL of a 1.43 M solution of KOH

My name is Ann [436]

Molarity is defined as the ratio of number of moles to the volume of solution in litres.

The mathematical expression is given as:

$Molarity = \frac{Number of moles}{volume of solution in litres}$

Here, molarity is equal to 1.43 M and volume is equal to 785 mL.

Convert mL into L

As, 1 mL = 0.001 L

Thus, volume = $785\times 0.001$ = 0.785 L

Rearrange the formula of molarity in terms of number of moles:

$Number of moles =molarity\times volume of solution in litres$

n = $1.43 M \times 0.785 L$

= 1.12255 mole

Now, Number of moles = $\frac{mass in g}{molar mass}$

Molar mass of potassium hydroxide = 56.10 g/mol

1.12255 mole = $\frac{mass in g}{56.10 g/mol}$

mass in g = $1.12255 mole\times 56.10 g/mol$

= 62.97 g

Hence, mass of $KOH$ = 62.97 g

7 0

3 years ago

5. What type of clouds can be found in the mesosphere?

Masja [62]

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I really hope this helps! I wish you the best of luck!

8 0

3 years ago

Someone help please.

mojhsa [17]

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3 years ago

How many Joules of energy in 3565 calories? Explain

nignag [31]

Answer:

14915960J

Explanation:

brendatferreira answered it on another slide this person said they used a converter

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3 years ago