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Murljashka [212]
3 years ago
11

What is transferred by a radio wave?

Physics
1 answer:
Alex3 years ago
4 0

Answer: B. energy

Explanation:

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For a wire has a circular cross section with a radius of 1.23mm.
Mila [183]

Answer:

5.731\times 10^{-5}\ m/s

Decrease

Explanation:

I = Current = 3.7 A

e = Charge of electron = 1.6\times 10^{-19}\ C

n = Conduction electron density in copper = 8.49\times 10^{28}\ electrons/m^3

v_d = Drift velocity of electrons

r = Radius = 1.23 mm

Current is given by

I=neAv_d\\\Rightarrow v_d=\dfrac{I}{neA}\\\Rightarrow v_d=\dfrac{3.7}{8.49\times 10^{28}\times 1.6\times 10^{-19}\times \pi (1.23\times 10^{-3})^2}\\\Rightarrow v_d=5.731\times 10^{-5}\ m/s

The drift speed of the electrons is 5.731\times 10^{-5}\ m/s

v_d=\dfrac{I}{neA}

From the equation we can see the following

v_d\propto \dfrac{1}{n}

So, if the number of conduction electrons per atom is higher than that of copper the drift velocity will decrease.

5 0
3 years ago
How does frequency and pitch affect sound
aleksandr82 [10.1K]
<span>The word that musicians use for </span>frequency<span> is </span>pitch<span>. The shorter the wavelength, the higher the </span>frequency<span>, and the higher the </span>pitch<span>, of the </span>sound<span>. In other words, short waves </span>sound<span> high; long waves </span>sound<span> low.</span>
7 0
3 years ago
(a) the gamma rays produced by a radioactive nuclide used in medical imaging (b) radiation from an FM radio station at 93.1 MHz
lawyer [7]

Answer:

They can be rank in the following way:

  • A radio signal from an AM radio station at 680 kHz on the dial
  • Radiation from an FM radio station at 93.1 MHz on the dial
  • The red light of a light-emitting diode, such as in a calculator
  • The yellow light from sodium vapor streetlights
  • The gamma rays produced by a radioactive nuclide used in medical

Explanation:

The electromagnetic spectrum is the distribution of radiation due to the different frequencies at which it radiates and its different intensities, that radiation is formed by electromagnetic waves, which are transverse waves formed by an electric field and a magnetic field perpendicular to it.

Radiation is distributed along that electromagnetic spectrum according to the wavelength or frequency.

Highest frequencies

X-rays

Ultraviolet rays

Visible region

Lower frequencies

Infrared

Microwave

Radio waves

Radio waves and the visible region (yellow light, red light) are part of the electromagnetic spectrum, any radiation of that electromagnetic spectrum has a speed of 3.00x10^{8}m/s in vacuum.

However, the following equation relates the velocity, the frequency, and the wavelength:

c = \nu \cdot \lambda  (1)

\nu = \frac{c}{\lambda} (2)

It can be see in equation 2 that the frequency and the wavelength are inversely proportional (when the frequency increases the wavelength decreases).

Therefore, for what was already discussed, they can be rank in the next way:

  • A radio signal from an AM radio station at 680 kHz on the dial
  • Radiation from an FM radio station at 93.1 MHz on the dial
  • The red light of a light-emitting diode, such as in a calculator
  • The yellow light from sodium vapor streetlights
  • The gamma rays produced by a radioactive nuclide used in medical

Summary:

In the case of the radio waves can be used:

Case for \nu = 93.1 MHz:

\lambda = \frac{c}{\nu}

\lambda = \frac{3x10^{8}m/s}{93100000s^{-1}}

\lambda = 3.22m

Case for \nu = 680 kHz:

\lambda = \frac{c}{\nu}

\lambda = \frac{3x10^{8}m/s}{680000s^{-1}}

\lambda = 441.17m

7 0
3 years ago
why tidal waves are not produced by gravitational pull of Sun? Although the gravitational pull of Sun is far more Stronger than
Elina [12.6K]
First of all, don't forget that the sun is 400 times farther from us than the moon is. That fact alone tells us that anything on the earth is attracted to each kilogram of the moon with a force that's 160,000 times stronger than the force that attracts it to each kilogram of the Sun.
But more to your point ... The tides ARE greatly influenced by the sun. That's why tides are considerably higher at New Moon, when the sun and moon are both pulling in the same direction.
5 0
3 years ago
What are the relative positions of the sun moon and earth during a full moon?
4vir4ik [10]
They are relatively straight or as straight as they are going to get during a given month that is when a full moon occurs.
6 0
3 years ago
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