What is the ultimate source of electromagnetic waves?A. Vibrating atoms
B. Vibrating molecules
C. Radio sets
D. Vibrating charged particles
E. TV antennas

Answers

Answer 1
Answer: The ultimate source of electromagnetic waves are the radio sets. The answer is letter C. One example of an electromagnetic radiation is the visible light. And visible light can be radio waves, infrared light and X - rays. The rays of the sun are a form of visible light. It has an electromagnetic radiation of UV (ultra violet) rays. That is why the radiation at day is greater than at day due to sun’s rays.

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Suppose Galileo dropped a lead ball (100 kilograms) and a glass ball (1 kilogram) from the Leaning Tower of Pisa. Which one hit the ground first? (Assume that there is no air resistance.) lead ball glass ball both at the same time either one, but not both at the same time
A wave travels at a constant speed. How does the frequency change if the wavelength increases by a factor of 2?A.The frequency decreases by a factor of 2. B.The frequency increases by a factor of 4. C.The frequency increases by a factor of 2. D.The frequency does not change.

which of the following is the true statement ? a. the magnetic force is perpendicular to the magnetic field direction. b. the magnetic force is parallel to the magnetic field direction. c. the magnetic force is antiparallel to the magnetic field direction. d. none of these

Answers

Answer:

A, magnetic force is always perpendicular to the magnetic field. The direction of the magnetic force is perpendicular to both the direction of the velocity and the direction of the magnetic field.

Final answer:

The magnetic force is always perpendicular to the direction of the magnetic field, according to the Right-Hand Rule in Physics. Neither parallel nor antiparallel statements are correct.

Explanation:

The correct answer to your question, in regard to the relationship between magnetic force and magnetic field direction, is option A. According to the Right-Hand Rule in Physics, the magnetic force exerted on a moving charged particle is always perpendicular to the direction of the magnetic field. This means the force and field are not parallel or antiparallel to each other, but rather, they meet at a 90-degree angle.

Learn more about Magnetic Field here:

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A radio station transmits waves at a frequency of 120MHz an a speed of 300 million m/s. Calculate the wavelength.

Answers

wavelength = (speed)/(frequency) = 300,000,000/120,000,000 = 2.5 meters

The doppler effect is the change in observed frequency due toa. the type of medium the wave is in
b. the type of wave
c. the original frequency of the source
d. the motion of the source or observer

Answers

d. the motion of the source or observer

I believe the answer is D, im not 100% sure though.

at a pressure 44 kpa the gas in a cylinder has a volume of 29 liters assuming temperature remains the same,if the volume of the gas is decreased to 4liters what is the new pressure?kpa

Answers

Assuming the gas is ideal, the ideal gas law can be used. To make things simpler, Boyle's law can also be used because it denotes the inverse relationship between pressure and volume at constant temperature. The solution to be used is as follows

P1V1 = P2V2
(44)(29) = P2(4)
P2 = 319 KPa

A submarine is 46 m below sea level, and it descends 24 m. How far below sea level is it? a. The submarine is 70 m below sea level. b. The submarine is 46 m below sea level. c. The submarine is 24 m below sea level. d. The submarine is 94 m below sea level.

Answers

Answer:70 m below

Explanation:

46 +24= 70

NEED THIS ANSWERED ASAP PLEASE!!!! Ocean Water Density 1 Lab

Materials-

Earth Science: A Reference Guide -Earth Science: A Reference Guide - Earth's Oceans (pp. 124-125), Oceans Temperature (pp.130-131), Ocean Salinity(pp.132-133), Density of Ocean Water (pp.134-135)

watch

4 cups -tap water - You will need an ice cube tray and access to a freezer to freeze the water.

teaspoon

salt, table

______________________________________________________________


1.) How will the ice water mix with the salty water? Write your hypothesis below.

(I can't add the picture of the chart so bear with me)

Solution - Hypothesis Describing Mixing - Hypothesis Describing Temperature

(Will the top be warmer, cooler, or the same as the bottom?)

Solution 1

(Freshwater) - -


Solution 2

(salty water) - _____________________ - ________________________


Solution 3

(saturated water)- ______________ - _____________________


2.) Complete the data table. Sketch, use your computer to draw or write a detailed description to describe how the ice melts into the different solutions. At each interval, record the temperature at the top and bottom of the glass.

(Again I can't add the pic of the chart so bear with me)


Solution 1 - 0 minutes- 5 minutes- 10 minutes- 30 minutes-

(Freshwater)


Temperature

(top of glass) -______________________________-

Temperature

(bottom of the glass)-_______________________________-


Solution 2- 0 minutes- 5 minutes- 10 minutes- 30 minutes-

(salty water)


Temperature

(top of glass)- ____________________________________-

Temperature

(bottom of glass)-_______________________________________


Solution 3

(saturated water)- 0 minutes- 5 minutes- 10 minutes- 30 minutes-


Temperature

(top of glass)-___________________________________

Teperature

(bottom of glass)-_______________________________________


3.) Summarize your data. Describe how the ice melted into each solution, and compare the temperatures at the top and bottom of the glass.

(can't add the pic, bear with me)

Solution-
Mixing (how did the colord, fresh, melt-water mix with the salty water?)- Temperature (Was the top warmer or cooler, or was it the same as the bottom?) -


Solution 1

(freshwater)-__________________________________________-

Solution 2

(salty water)-___________________________________________

Solution 3

(saturated water)- ____________________________________


4.) What does your experiment suggest about what happens when icebergs melt into the ocean? Based on your data, do you think the sea-surface temperatures are warmer or cooler due to the melting water? Make sure you explain how your experiment helps you answer this question.


I really need help with this as soon as possible, if you do not know the answer to this do not answer please, let me repeat that, PLEASE DON'T ANSWER IF YOU DON'T KNOW THE ANSWER TO ALL THE QUESTIONS, also if your a k12 student, friend me so we can help each other with quizzes and stuff, and if you are a k12 student and you answer this, please don't put your exact answers on this, make it different from yours, I don't want a heart-attack email from my teacher

Answers

The way ice water mix with the salty water is that  when a person adds salty water to ice, the salt will be the first thing to dissolves in the layer of liquid water that is seen on the surface.

By reducing the  freezing point below the ices temperature, when the Ice is said to be in contact with salty water, it tends to melts, forming more liquid water, that will then dissolves more salt, causing a lot of ice to melt, and the process still goes on.

Learn more about Water Density from

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