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2 years ago

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Question 10 of 10

1 answer:

Margaret [11]2 years ago

7 0

Answer: D. $5.0(10)^{-38} J$

Explanation:

The energy $E$ of an electromagmetic wave is given by:

$E=\frac{hc}{\lambda}$

Where:

$h=6.626(10)^{-34}J.s$ is the Planck constant

$c=3(10)^{8} m/s$ is the speed of light in vacuum

Then $hc=1.99 (10)^{-25}Jm$

$\lambda=4.0(10)^{12} m$ is the wavelength

Solving:

$E=\frac{1.99 (10)^{-25}Jm}{4.0(10)^{12} m}$

$E=5.0(10)^{-38} J$

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Answer:

c. low beams and fog lights

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2 years ago

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A horizontal rectangular surface has dimensions 2.80 cm by 3.20 cm and is in a uniform magnetic field that is directed at an ang

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Answer:

magnitude of the magnetic field 0.692 T

Explanation:

given data

rectangular dimensions = 2.80 cm by 3.20 cm

angle of 30.0°

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solution

we take here rectangular side a and b as a = 2.80 cm and b = 3.20 cm

and here angle between magnitude field and area will be ∅ = 90 - 30

∅ = 60°

and flux is express as

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and Ф = BA cos∅ ............2

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B = $\frac{\phi }{abcos\theta }$ ..............3

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2 years ago

A piece of blue paper appears blue because the paper

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A piece of blue paper appears blue because the paper absorbs all colors of light except blue. <em> (b)</em>

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2 years ago

If a wave has a frequency of 50 Hz and a wavelength of 3 meters, what is its Velocity? (Use

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Answer:

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2 years ago

A river flows due east at 12 km/h. A boat crosses the 720 m wide river by maintaining a constant velocity of 72 mi/h due north r

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Answer:

The boat will be 74 .17 meters downstream by the time it reaches the shore.

Explanation:

Consider the vector diagrams for velocity and distance shown below.

converting 72 miles per hour to km/hr

we have 72 miles per hour 72 × 1.60934 = 115.83 km/hr

The velocity vectors form a right angled triangle, and can be solved using simple trigonometric laws

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<em>From the sketch of the displacement vectors, we can use trigonometric ratios to determine the distance the boat moves downstream.</em>

Let x be the distance the boat moves downstream.d

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2 years ago