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STatiana [176]
3 years ago
6

Which of the following is an observation? A. The baby was crying very loudly; therefore, he must have been hungry. B. Jason star

ed at his computer screen for 2 minutes and then starting typing on the keyboard very rapidly. C. Stella must have been very upset when she left the room and slammed the door behind her. D. John was jumping up and down because he was excited about his new puppy.
Physics
2 answers:
Serga [27]3 years ago
8 0
B.
An observation is only what you can see/observe.
To make an assumption of anything does not make it an observation,but a prediction.
Hope this helps!
Marianna [84]3 years ago
3 0
B is an observation
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Why is it important to study electromagnetic waves?
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A length of copper wire has a resistance 44 Ω. The wire is cut into three pieces of equal length, which are then connected as pa
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Answer:

\frac{R}{1} = \frac{44}{9}\ohm

Explanation:

Let us imagine that there are three wire of length equal length having equal resistances each of 44/3 Ω

Now connect these wires in parallel to so that their equivalent resistance is R.

then

\frac{1}{R} = \frac{1}{R_1}+\frac{1}{R_2}+\frac{1}{R_3}

\frac{1}{R} = \frac{3}{44}+\frac{3}{44}+\frac{3}{44}

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3 years ago
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Monochromatic coherent light shines through a pair of slits. If the wavelength of the light is decreased, which of the following
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Answer:

he correct answers are a, b

Explanation:

In the two-slit interference phenomenon, the expression for interference is

          d sin θ= m λ                       constructive interference

          d sin θ = (m + ½) λ             destructive interference

in general this phenomenon occurs for small angles, for which we can write

           tanθ = y / L

           tan te = sin tea / cos tea = sin tea

           sin θ = y / La

un

derestimate the first two equations.

Let's do the calculation for constructive interference

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the distance between maximum clos is and

         y = (me / d) λ

this is the position of each maximum, the distance between two consecutive maximums

         y₂-y₁ = (L   2/d) λ - (L 1 / d) λ₁          y₂ -y₁ = L / d λ

examining this equation if the wavelength decreases the value of y also decreases

the same calculation for destructive interference

         d y / L = (m + ½) κ

         y = [(m + ½) L / d] λ

again when it decreases the decrease the distance

the correct answers are a, b

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