1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
ycow [4]
4 years ago
15

1. Electromagnetic radiation is more common than you think. Radio and TV stations emit radio waves when they broadcast their pro

grams; microwaves cook your food in a microwave oven; dentists use X rays to check your teeth. Even though they have different names and different applications, these types of radiation are really all the same thing: electromagnetic (EM) waves, that is, energy that travels in the form of oscillating electric and magnetic fields. Which of the following statements correctly describe the various applications listed above?A. All these technologies use radio waves, including low-frequency microwaves. B. All these technologies use radio waves, including high-frequency microwaves. C. All these technologies use a combination of infrared waves and high-frequency microwaves. D. Microwave ovens emit in the same frequency band as some wireless Internet devices. E. The radiation emitted by wireless Internet devices has the shortest wavelength of all the technologies. F. All these technologies emit waves with a wavelength in the range 0.10 to 10.0 m. G. All the technologies emit waves with a wavelength in the range 0.01 to 10.0 km.2. Despite their extensive applications in communication systems, radio waves a not the only form of EM waves present in our atmosphere. Another form of EM radiation plays an even more important role in our life (and the life of our planet) sunlight. The sun emits over a wide range of frequencies; however, the fraction of its radiation that reaches earth's surface is mostly in the visible spectrum. (Note that about 35% of the radiation coming from the sun is absorbed directly by the atmosphere before even reaching the earth's surface). The earth, then, absorbs this radiation and reemits it as infrared waves. Based on this information, which of the following statements is correct? A. The earth absorbs visible light and emits radiation with a shorter wavelength. B. The earth absorbs visible light and emits radiation with a longer wavelength. C. The earth absorbs visible light and emits radiation with a lower frequency. D. The earth absorbs visible light and emits radiation with a higher frequency.
Physics
1 answer:
devlian [24]4 years ago
7 0

For the first question

Answers:

b.) All these technologies use radio waves, including high-frequency microwaves

d.) Microwave ovens emit in the same frequency band as some wireless Internet devices.

e.) The radiation emitted by wireless Internet devices has the shortest wavelength of all the technologies listed above.

f.) All these technologies emit waves with a wavelength in the range of 0.10 to 10.0 m.

For second question

Answer:

B. The earth absorbs visible light and emits radiation with a longer wavelength

C. The earth absorbs visible light and emits radiation with a lower frequency.

Both options are correct

Explanation:

In the EM spectrum, wavelenght reduces with increasing energy and frequency increases with increasing energy. The order of increasing energy is radio wave, microwave, infrared rays, visible rays, ultraviolet rays, xrays, gamma rays.

If the earth absorbs visible rays of higher energy, and radiates infrared rays of lower energy, then this means that the radiated radiation will have a longer wavenght, and a lower frequency.

You might be interested in
A guitar string is 0.620 m long, and
miskamm [114]

Answer:

The answer to this problem is 290.16m/s

3 0
3 years ago
An object is dropped from a very tall bridge. If it takes 29.48 s to reach the ground below, how high is the bridge?////
LenKa [72]

Answer:

ithe bridge is about 3.01 or exactly 3.0081632653

5 0
4 years ago
Where does the energy of an earthquake originate?
expeople1 [14]
A. Movement of tectonic plates... When these plates move they create an earthquake
4 0
3 years ago
Read 2 more answers
What energy transformation occurs during photosynthesis?
konstantin123 [22]
Light energy<span> from the sun is being converted to chemichal potenstial </span>energy<span>(which is stored </span>energy<span>). </span>Photosynthesis<span> is a chemical process that takes place in the presence of sunlight, wherein plants make their food and build stores of </span>energy<span>. This phenomenon </span>occurs<span> in chlorophyll containing plant cells.  
                                hope this helps

</span>
3 0
3 years ago
A point charge q1 = -8.9 μC is located at the center of a thick conducting shell of inner radius a = 2.8 cm and outer radius b =
musickatia [10]

Answer:

1) Ex(P) = -8.34602 N/C

2) E_y(P) = -5.23850174216 N/C

3) Question (3) is a similar question to (1)

4) E_y(P) = -5.23850174216 N/C

5) \sigma _b ≈ 1.041466 C/m²

6) σₐ ≈ 2.2330413 C/m²

Explanation:

The given parameter of the point charge located at the center of a conducting shell

The charge of the point charge, q₁ = -8.9 μC

The inner radius of the shell, a = 2.8 cm

The outer radius of the shell, b = 4.1 cm

The charge of the conducting shell, q₂ = 2.2 μC

Therefore, we have;

1) The point P(8.5, 0)

V = k \cdot \dfrac{q_1 + q_2 }{r^2}

By plugging in the values, we have;

For

R₁ < R₂ < r, for the electric field at the point, 'P', we have;

E_x(P) = 9 \times 10^9 \times \dfrac{-8.9 \ \times 10^{-6} + 2.2 \ \times 10 ^{-6} }{(0.085 \ )^2} = -8.34602

Ex(P) = -8.34602 N/C

2) For the point given with coordinates (8.5, 0), the distance of the y-component of point from the center = 0

The y-component of the electric field = 0 N/C

4) For r = 1.4 cm, along the y-axis we have;

R₁ < r < R₂

Therefore, we have;

E = k \cdot \left( \dfrac{q_1 }{r} + \dfrac{q_2}{R_2}\right)

Substituting the values, we get;

E_y(P) = 9 \times 10^9 \times \left( \dfrac{-8.9 \times 10^{-6}}{0.014} + \dfrac{2.2 \times 10^{-6}}{0.041}\right) = -523850174216

E_y(P) = -5.23850174216 N/C

5) The charge density, \sigma _b, is given as follows;

\sigma_b = \dfrac{Q}{A}  = \dfrac{2.2 \times 10^{-6} }{4\times \pi  \times 0.041^2 } \approx 1.041466 \ C/m^2

6) Similarly, we have;

\sigma_a = \dfrac{Q}{A_a}  = \dfrac{2.2 \times 10^{-6} }{4\times \pi  \times 0.028^2 } \approx 2.2330413 \ C/m^2

5 0
3 years ago
Other questions:
  • Consider the following statements. A. Heat flows from an object at higher temperature to an object at lower temperature; B. Heat
    5·1 answer
  • Whom ever can spell the sound of a sniff gets 100 poibts personally
    9·2 answers
  • Starfish Regrowth
    5·1 answer
  • A student wants to determine the coefficients of static friction and kinetic friction between a box and a plank. She places the
    11·1 answer
  • A fireman of mass 80 kg slides down a pole. For the steps and strategies involved in solving a similar problem, you may view a V
    7·1 answer
  • The pressure gauge on a tank registers the gauge pressure, which is the difference between the interior pressure and exterior pr
    5·1 answer
  • A conductor carrying 14.7 amps of current is directed along the positive x-axis and perpendicular to a uniform magnetic field. A
    13·1 answer
  • A bus goes from rest to 20 m/s. The bus accelerates at 2 m/s^2. How far does the bus go?
    15·1 answer
  • A pulley system with a mechanical advantage of 15 is used to lift a 1750 N piano to a third floor balcony that is 7 m above the
    7·1 answer
  • A sound wave has a frequency of 265 hz and a wavelength measured at 1.3
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!