PHYSICS HIGH SCHOOL

What frequency should a radio station have if It wave are to have a wavelength of 200m ​

Answers

Answer 1
Answer:

Answer:

Radio waves are a type of electromagnetic radiation with frequencies ranging from 300 GHz to as low as 3 Hz, and wavelengths ranging from 1 millimeter (0.039 inches) to 100 kilometers (62 miles). Similar to all other electromagnetic waves, they travel at the speed of light.

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When glaciers melt, they leave ridges of rock, gravel, sand, and clay called _______.
The product of the frequency and the wavelength of a wave equals thea. number of waves passing a point in a second.b. speed of the wave.c. distance between wave crests.d. time for one full wave to pass.
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What collides and creates a movement of heat called conduction?A. photonsB. compoundsC. MoleculesD. atoms​

Traditional explosives use the energy released by chemical reactions. Nuclear weapons use the energy released by nuclear reactions. Why are nuclear weapons much more destructive than traditional explosives? Question 16 options: A. Chemical reactions can release much more energy than nuclear reactions B. Chemical reactions always use more energy than they release Nuclear weapons always contain more chemicals than traditional explosive C. Chemical reactions always release more energy than they use D. Nuclear reactions can release much more energy than chemical reactions

Answers

I believe the correct answer from the choices listed above is option D. Nuclear weapons are much more destructive than traditional explosives because nuclear reactions can release much more energy than chemical reactions. Hope this answers the question.

Answer: The correct answer is option D.

Explanation:

Chemical reactions are defined as the reactions in which rearrangement of one or more substances gets converted to one or more different substances known as products. Energy is released in the reactions where energy of products is less than the energy of the reactants.

Nuclear reactions are the reactions in which atomic nucleus undergoes change and releases a huge amount of energy in the process. There are two types of nuclear reactions: Nuclear fusion and nuclear fission. Both the nuclear reactions releases a huge amount of energy.

From the given information above, we conclude that the correct option is Option D.

A bicyclist in the Tour de France crests a mountain pass as he moves at 15 km/h. At the bottom, 4.2 km farther, his speed is 65 km/h. Estimate his average acceleration while riding down the mountain.

Answers

18 km/hr*1000m/km*1 hr/3600 sec= 5 m/sec 

85 km/hr= 23.6 m/s 

distance = 4000m 

distance= initial distance+initial velocity*time+ 1/2 acceleration*time^2 

initial distance=0 

4000= 5.0*t+ 1/2 (accel)(time)^2 

Velocity=initial velocity+ acceleration * time 

23.6 m/s= 5.0 m/s+ acceleration * time 

We now have two equations and two unknowns. Solve them and you have your answer.

The light you see around you from the Sun is called UVvisibleX-infrared rays.

Answers

The correct answer for the question that is being presented above is this one: "Ultraviolet rays." The light you see around you from the Sun is called ultraviolet rays. Sunlight is a portion of the electromagnetic radiation given off by the Sun, in particular infrared, visible, and ultraviolet light.

When demonstrating the interference of light waves, the dark fringes that appear represent where the waves interfere _________________. A. Constructively
B. Not at all
C. Destructively
D. A little bit

Answers

The dark fringes that appear represent where the waves interfere

C. Destructively

Explanation:

Interference is a phenomenon typical of waves, that occurs when two waves meet at a certain point in space. The amplitude of the resultant wave can be found by using the principle of superposition, which states that the displacement of the resultant wave is the sum of the displacements of each wave. In particular, there are two extreme cases that can occur:

- Constructive interference:  this occurs when the two waves meet in phase - i.e., the crest of one wave meets with the crest of the other wave. In this case, the amplitude of the resultant wave is twice the amplitude of each wave.

- Destructive interference: this occurs when two waves meet in anti-phase - i.e, the crest of one wave meets with the trough of the other wave. In this case, the amplitude of the resultant wave is equal to the difference between the two amplitues (and if the two waves have same amplitude, the resultant amplitude will be zero).

This phenomenon can occur also with light wave (which is a type of wave), and it leads to:

- The presence of bright fringes in case of constructive interference

- The presence of dark fringes in case of destructive interference

Therefore, the correct answer is

C. Destructively

Learn more about waves:

brainly.com/question/5354733

brainly.com/question/9077368

#LearnwithBrainly

Answer:

When demonstrating the interference of light waves, the dark fringes that appear represent where the waves are destructively interfere destructively.

Explanation:

The bright lines symbolize constructive interference and some dark lines symbolize destructive interference.

  • Interference does a phenomenon typical of waves, that occurs during two waves meet at a particular point in space. The amplitude of the resultant wave can do determined by using the system of superposition, which states that the displacement of the resultant wave equals the sum of the displacements of each wave. Inappropriate, two extreme cases can occur:
  • Constructive interference:  that happens when the two waves participate in the state - i.e., the peak of individual waves agrees with each peak of each and every other wave. For this situation, the adequacy of this resultant wave infers double the abundancy from all waves.
  • Destructive interference: that occurs when two waves joins in anti-phase - i.e, the crest of one wave joins with the through of the other waves.  In this case, the amplitude of the resultant wave is equal to the difference between the two amplitudes (and if the two waves have the same amplitude, the resultant amplitude will be zero).
  • This phenomenon can occur also with lightwave (which is a type of wave), and it leads to:
  • The presence of bright fringes in case of constructive interference
  • The presence of dark fringes in case of destructive interference

Therefore the correct answer is option C

To learn more about interface waves, refer:

brainly.com/question/16612684

A stone thrown from a height of 5.72 meters hits the ground at 13.3, Calculate the initial speed. Neglect air resistance

Answers

Answer:

12.31618 m/s

Explanation:

s = Displacement

t = Time taken

g = Acceleration due to gravity = 9.81 m/s² = a

s=ut+(1)/(2)at^2\n\Rightarrow 5.72=0t+(1)/(2)* 9.81* t^2\n\Rightarrow t=\sqrt{(5.72* 2)/(9.81)}\n\Rightarrow t=1.07988\ s

Velocity is given by

v=(s)/(t)\n\Rightarrow v=(13.3)/(1.07988)\n\Rightarrow v=12.31618\ m/s

The initial velocity is 12.31618 m/s

A 70 kilogram mountaineer is standing on the summit of Mt. Everest. The distance between the mountaineer and the center of Earth is 6.39 × 106 meters. What is the magnitude of the force of gravity acting on the mountaineer? (The value of G is 6.673 × 10-11 newton meter2/kilogram2. The mass of Earth is 5.98 × 1024 kilograms.)90.50 newtons



111.5 newtons



684.1 newtons



4041.7 newtons

Answers

The force due to gravity between two point masses is given by:
F = GMm/r²; where G is the gravitational constant, M is the larger mass, m is the smaller mass, and r is the distance between the two.
F =  (6.673 × 10⁻¹¹ × 5.98 × 10²⁴ × 70) / (6.39 × 10⁶)²
F = 684.1 N
 F = GMm/r² 

F = (6.673*10^-11)(5.98*10^24)(70)/(6.39*10^... 

F = 684 N (3sf)
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