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3 years ago

Which statement is false?

2 answers:

8 0

Trigonometric functions which are related by having the same value at complementary angles are called cofunctions. Cofunctions of complementary angles are equal.

A. csc 20' = csc(90-70)=sec 70

B. cos 87' = cos (90-3)=sin 3'

C. csc 40' = csc(90-50) =sec50'

D. tan 15' = tan(90-75)= cot 75'

Among all the option c is not correct.

Option C is false.

arlik [135]3 years ago

5 0

Answer: Option <span>C. csc 40' = sin 50'
Because csc and sin are not cofunctions</span>

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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?

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T = ___________ s

Answer:

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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)

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2 years ago

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Answer:

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Step-by-step explanation:

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