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2 years ago

1. Most waves are caused by vibrations. What motion in a transmitting antenna causes the vibrations that produce radio waves?

2 answers:

8 0

The answer 1 is
The best-known use of radio waves is for communication; television, cellphones and radios all receive radio waves and convert them to mechanical vibrations in the speaker to create sound waves that can be heard.Electromagnetic radiation is transmitted inwaves or particles at different wavelengths and frequencies.

the answer 2 is

Radio Waves: Instant Communication
Microwaves: Data and Heat

i think the answer number 3 is
It is all about wavelength versus tunnel diameter. The wavelength of GPS is about 20cm it would happily propagate in any normal tunnel if it could get in but the earth and other structures absorb it. AM radio (600kHz - 1500kHz) cannot propagate in any normal tunnel because the wavelength is too long (500m-200m) relative to the diameter, and thus gets reflected at the entrance. FM (100MHz ~ 3m) would propagate and it does for a while but then it suffers reflections

Sladkaya [172]2 years ago

3 0

Answer:

1.Oscillatory motion : this is the to and fro movement of wave signals from the antenna

2.a.Microwave Oven- produces microwaves

b.. Light bulb-produces visible light

3.Radio signals does not pass through a solid barrier in the dark. Just like how light can't pass through a rock. The radio signals are restored as the car gets to the entrance of the tunnel

Explanation:

Waves is a disturbance which travels displacement and transfers energy without displacing the medium itself

Most waves are caused by vibrations. What motion in a transmitting antenna causes the vibrations that produce radio waves?

Oscillatory motion : this is the to and fro movement of wave signals from the antenna

2. Name two common household appliances that produce electromagnetic waves other than radio waves. What kind of electromagnetic waves do they produce?

a.Microwave Oven- produces microwaves

b.. Light bulb-produces visible light

3.When you are in a car and it passes through a tunnel, the radio signal is sometimes lost. Why do you think this happens?

Radio signals does not pass through a solid barrier in the dark. Just like how light can't pass through a rock. The radio signals are restored as the car gets to the entrance of the tunnel

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The displacement vector from your house to the library is 740 m long, pointing 40 ∘ north of east. Part A What are the x-compone

Ilia_Sergeevich [38]

The horizontal component of the displacement is 566.9 m

Explanation:

The horizontal (x-) and vertical (y-) components of a vector on the Cartesian plane can be found as follows:

$v_x = v cos \theta$

$v_y = v sin \theta$

where

v is the magnitude of the vector

$\theta$ is the angle representing the direction of the vector, measured as above the x-axis.

In this problem, we have:

v = 740 m (magnitude of the vector)

$\theta=40^{\circ}$ (direction of the vector)

Therefore, the two components are

$v_x = (740)(cos 40)=566.9 m$

$v_y = (740)(sin 40)=475.7 m$

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2 years ago

A scuba diver uses his waterproof flashlight to shine a beam of light so that it strikes the surface of the water at an angle of

Mrrafil [7]

Snell's law: n1Sinα=n2Sin β where α=Incidence angle, β=angle of refraction, n1 and n2 are the indices of refraction for water and air respectively.
Therefore,
Sinα=n2/n1 Sinβ For refracted ray to be along the surface of water, β=90° and thus Sinβ = 1

Sinα=n2/n1= 1/1.33 = 0.7519 => α=sin^-1 (0.7519) = 48.75°
When light moves from a medium of higher index of refraction (such as water) to medium of lesser index of refraction (such as air), the refracted ray is bend such that α is bigger than β. This is internal refraction. At some value of α, β approaches 90°. This incidence angle is called critical incidence angle. Therefore, the current scenario is shows critical angle of incidence.

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Identify and explain one way in which we try to deal with infiltration? What are the benefits and cost of that particular soluti

tigry1 [53]

Answer:

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Explanation:

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2 years ago

the goat weighs 900 N and is 1 meter from the fulcrum. The strongman pulls down on the lever 3 meters from the fulcrum. What is

garik1379 [7]

Answer: The smallest effort = 300N

Explanation:

Using one of the condition for the attainment of equilibrium:

Clockwise moment = anticlockwise moments

900 × 1 = 3 × M

Where M = the weight of the strong man

3M = 900

M = 900/3 = 300N

Therefore, 300N is the smallest effort that the strongman can use to lift the goat

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Why doesn't the force of gravity change the speed of a bowling ball as it rolls along a bowling lane?

Oliga [24]

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