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Slav-nsk [51]
3 years ago
15

Two light waves are initially in phase and have the same wavelength, 470 nm. They enter two different media of identical lengths

of 2.50 µm. If n1 = 1.2 and n2 = 1.5, what is the effective phase difference of the waves when they exit the media? Group of answer choices 3.7 rad 10 rad 1.6 rad 0.6 rad 0 rad
Physics
1 answer:
-Dominant- [34]3 years ago
5 0

Answer:

= 3.7 radians = effective phase difference

Explanation:

Wavelength given =\lambda= 470 nm

n1 = 1.2 and n2 = 1.5

The light rays are traveling at different speeds inside the 2 different layers.

So effective optical path is given by  n d

where n is the refractive index of the medium and

d is the length traveled by the light ray in the medium.

The path difference introduced because of 2 different medium is

length = distance traveled by the wave = d = 2.5 x 10^-6 m

Phase difference =2 \pi / \lambda * path difference

path difference = (n₂ - n₁ ) d

= (1.5 - 1.2) (2.5 x 10⁻⁶)

= 7.5 x 10⁻⁷ m

phase difference = 2 pi / (470 x 10⁻⁹) * (7.5 x 10⁻⁷) = 10 rad

2 pi radians is 360 degrees

10 radians = 573 degrees

Phase difference = 573 - 360 = 212 degrees

= 3.7 radians = effective phase difference

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Enter an expression for the force constant for the floating raft, in terms of L, g, and the density of water, ρ.
andriy [413]

Answer:

K = ρL²g

Explanation:

Consider L as the length of the raft inside the water when the raft is displaced through additional distance y;

Then:

F = upthrust ( restoring force) = weight of the liquid displaced.

F = V_{\omega} \rho_{\omega} g= A y \rho_{\omega} g

where;

A = L²

\rho_{\omega} = \rho

F = ky.

Then,

Ay \rho g = ky

L^2y \rho g = ky

Divide both sides by y

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3 0
3 years ago
A bus accelerates forward. If an apple were on the floor of the bus it would move forward.
Paladinen [302]

Answer:

False

Explanation:

Since it is on the bus, it would not move forward because the outside acceleration cannot be considered.

4 0
2 years ago
A device for training astronauts and jet fighter pilots is designed to rotate the trainee in a horizontal circle of radius 11.0
kvv77 [185]

The velocity of the trainee is 29 m/s or 0.42 rev/s

<h3>Further explanation</h3>

Acceleration is rate of change of velocity.

\large {\boxed {a = \frac{v - u}{t} } }

\large {\boxed {d = \frac{v + u}{2}~t } }

<em>a = acceleration (m / s²)v = final velocity (m / s)</em>

<em>u = initial velocity (m / s)</em>

<em>t = time taken (s)</em>

<em>d = distance (m)</em>

Centripetal Acceleration of circular motion could be calculated using following formula:

\large {\boxed {a_s = v^2 / R} }

<em>a = centripetal acceleration ( m/s² )</em>

<em>v = velocity ( m/s )</em>

<em>R = radius of circle ( m )</em>

Let us now tackle the problem!

<u>Given:</u>

Radius of horizontal circle = R = 11.0 m

Force Felt by the Trainee = F = 7.80w

<u>Unknown:</u>

Velocity of Rotation = v = ?

<u>Solution:</u>

F = ma

F = m\frac{v^2}{R}

7.80w = m\frac{v^2}{R}

7.80mg = m\frac{v^2}{R}

7.80g = \frac{v^2}{R}

7.80 \times 9.8 = \frac{v^2}{11.0}

v^2 = 840.84

v \approx 29 ~m/s

\omega = \frac{v}{R}  → in rad/s

\omega = \frac{v}{2 \pi R}  → in rev/s

\omega = \frac{29}{2 \pi \times 11.0}

\omega \approx 0.42 ~ rev/s

<h3>Learn more</h3>
  • Velocity of Runner : brainly.com/question/3813437
  • Kinetic Energy : brainly.com/question/692781
  • Acceleration : brainly.com/question/2283922
  • The Speed of Car : brainly.com/question/568302
  • Uniform Circular Motion : brainly.com/question/2562955
  • Trajectory Motion : brainly.com/question/8656387

<h3>Answer details</h3>

Grade: High School

Subject: Physics

Chapter: Circular Motion

Keywords: Velocity , Driver , Car , Deceleration , Acceleration , Obstacle , Speed , Time , Rate , Circular , Ball , Centripetal

6 0
3 years ago
Read 2 more answers
Air resistance is a nonconservative force. It always opposes the motion of an object. An airplane flies from New York to Atlanta
gulaghasi [49]

Answer:

c. is negative

Explanation:

When the magnitude of force is multiplied with the force vector's projection along the direction of the vector of displacement which is negative as it is a resistive force we get the work done.

As the wind is acting in opposite direction of the force which is being applied by the plane the work done will be negative. Also, the net work will be the sum of many smaller negative quantities.

Hence, the answer here is negative.

6 0
3 years ago
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