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3 years ago

So if I have 4 over 5 what is the precent?

Mathematics

2 answers:

baherus [9]3 years ago

8 0

Answer:

Step-by-step explanation:

4 over 5 = 4/5

First, multiply 20 to both numerator and denominator:

(4/5)(20/20) = 80/100

Next, change the fraction into a decimal. move the decimal sign to the left two place values (and drop the denominator)

80/100 = 0.80

Next, to change the decimal to a percentage, move the decimal point to the right two place value and add the % sign.

0.80 = 80%

80% is your answer

levacccp [35]3 years ago

3 0

Answer:

The answer is 80%

Step-by-step explanation:

I tried to explain but I do not know how to word it out sorry:(

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A beam of light from a monochromatic laser shines into a piece of glass. The glass has thickness L and index of refraction n=1.5

boyakko [2]

Additional information to complete the question:

How long does it take for a short pulse of light to travel from one end of the glass to the other?

Express your answer in terms of some or all of the variables f and L. Use the numeric value given for n in the introduction.

T = ___________ s

Answer:

$T = \frac{15}{f}$

Step-by-step explanation:

Given:

Thickness og glass = L

Index of refraction n=1.5

Frequency = f

$Wavelength = \frac{L}{10}$

λ(air) $= \frac{L}{10}$

λ(glass) = λ(air) / n

= $\frac{\frac{L}{10}}{1.5}$

= $\frac{L}{10} * \frac{1}{1.5}$

= $\frac{L}{15}$

V(glass) = fλ(glass)

$= f * \frac{L}{15}$

$T = \frac{L}{V_{glass}} = \frac{15}{f}$

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