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natima [27]
3 years ago
10

Ask Your Teacher A beam of light is incident from air on the surface of a liquid. If the angle of incidence is 33.5° and the ang

le of refraction is 19.3°, find the critical angle for the liquid when surrounded by air.
Physics
1 answer:
Oduvanchick [21]3 years ago
5 0

Answer:

The critical angle for the liquid when surrounded by air is 30 degrees.      

Explanation:

Given that,

The angle of incidence is 33.5° and the angle of refraction is 19.3°. Firstly, we can find the refractive index of the liquid. It can be calculated using Snell's law as :

n=\dfrac{\sin i}{\sin r}\\\\n=\dfrac{\sin (33.5)}{\sin (19.3)}\\\\n=2

The critical angle is given by :

\theta_c=\sin^{-1}(\dfrac{n_1}{n_2})

Here, n_1 is refractive index of air and n_2 is refractive index of liquid.

\theta_c=\sin^{-1}(\dfrac{1}{2})\\\\\theta_c=30^{\circ}

So, the critical angle for the liquid when surrounded by air is 30 degrees.

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You are on the south bank of the river in your canoe you need to reach the north bank you know that you can row your canoe at 2
Anna71 [15]

Answer:

(θ) = 60°

Explanation:

Given:

Speed of canoe Vc = 2 m/s

Speed of River Vr = 1 m/s

Computation:

Vc (Cosθ) = Vr

2 (Cosθ) = 1

(Cosθ) =  1 / 2

(Cosθ) = (Cos60)

(θ) = 60°

3 0
2 years ago
An elevator carrying a person of mass m is moving upward and slowing down. How does the magnitude f of the force exerted on the
V125BC [204]

The force f of the elevator on the man keeps reducing as the elevator keeps going up while the gravitational force mg keeps increasing moving upwards.

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An elevator is an electrical device that lifts people up and down a tall building or structure.

for the elevator to go up, f > mg.

for the elevator to come down mg > f.

Analysis

since the force on the man is f = ma

where a is the acceleration of the elevator, then it means when a increases,  f will increase and when it decreases, f would decrease. slowing down means a, is decreasing going up and this reduces the force as the elevator keeps going up.

on the other hand, gravity acts faster on bodies that are slower in motion so since g, increases going up, mg would also increase.

Learn more about forces in an elevator : brainly.com/question/13526583

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6 0
1 year ago
Which types of geometrical symmetry does a sphere have?.
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A sphere has reflection symmetry across any plane through its center.
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Which of the following are basic principles that apply to circuits? Choose the 2 correct answers from the choices below.
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The basic principles that apply to circuits is that electrons must receive energy from a source, and electrons transfer energy to perform some useful function.

<h3 /><h3>What is circuit?</h3>

Individual electronic components, like resistors, transistors, are connected by metallic wires or traces by which the electric current can flow to form a circuit design.

The basic principles that apply to circuits will be;

1. Electrons must receive energy from a source.

2. Electrons transfer energy to perform some useful function.

Hence, option 1 and 2 are correct.

To learn more about the circuit, refer to the link;

brainly.com/question/21505732

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A water wave travels 36 meters in 15 seconds. What is the speed of the wave?
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2.4 meters per second

I hope this helps
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3 years ago
Read 2 more answers
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