1.A weatherman reports, “The storm waves are about 2 meters high and about 35 meters apart.” What properties of waves is the reporter describing? (1 point)
A.frequency and wavelength
B.wavelength and wave speed
C.amplitude and wavelength ***
D.amplitude and frequency
2.
Soundproof rooms take advantage of which property of waves? (1 point)
A.absorption
B.regular reflection
C.Refraction ***
D.diffuse reflection
3.
When the energy of a sound wave is transferred to a particle of a medium and causes it to vibrate and generate heat, the sound wave is (1 point)
A.reflected.
B.refracted.
C.absorbed.***
D. Transmitted.
5.
The pitch of the siren of a moving fire truck changes from high to low as the fire truck passes by. What property of a sound wave changes as the fire truck goes by? (1 point)
A.amplitude ***
B.density
C.temperature
D. frequency
6.
Sonar is used to inspect pipelines and bridge foundations. In this scenario, sonar takes advantage of the fact that (1 point)
A.sound waves can reflect.
B.sound waves can diffract.
C.sound waves can spread out.
D.sound waves can refract. ***
7.
Which of the following correctly describes a gamma ray? (1 point)
A.long wavelength and low frequency
B.long wavelength and high frequency ***
C.short wavelength and low frequency
D.short wavelength and high frequency
8.
Which of the following is true about all electromagnetic waves in a vacuum? (1 point)
A.They all carry the same energy.
B.They all travel at the same speed. ***
C.They all have the same frequency.
D.The all have the same wavelength.
9.
FM signals travel as changes in (1 point)
A.the speed of the wave.
B.the amplitude of the wave.
C.the frequency of the wave.***
D.the loudness of the wave.
10.
What is the principle role of a tower within a cellular system? (1 point)
A.to track data usage
B.to transmit signals ***
C.to pinpoint locations
D.to reduce line noise
11.
Henri Becquerel expected to see only weak images on the photographic plate containing the uranium salt because he thought (1 point)
A.fluorescent minerals needed direct sunlight to produce radio waves.
B.fluorescent minerals needed direct sunlight to produce X-rays.***
C.fluorescent minerals needed direct sunlight to produce microwaves.
D.fluorescent minerals needed direct sunlight to produce gamma rays.
12.
Marie and Pierre Curie noticed burns on their fingers after handling test tubes containing radioactive substances. This observation led to (1 point)
A.the discovery of natural fluorescence. B.the discovery of X-rays. ***
C.the discovery of radiation therapy.
D.the discovery of uranium.
13.
How does radioactivity make it possible to understand how Earth can be so old and still have a hot interior? (1 point)
A.Radioactive elements trap heat from underground magma chambers. ***
B.Radioactive elements absorb heat from the atmosphere and release it underground.
C.Radioactive elements near the core release heat as their nuclei decay.
D.Radioactive elements absorb the cold temperatures underground.
14.
The speed of sound depends on (1 point)
A.the loudness of the sound.
B.the pitch of the sound.
C.the source of the sound.
D.the properties of the medium it travels through. ***
15.
The image of a mountain can be seen on the surface of calm water. What property of light is demonstrated? (1 point)
A.diffuse reflection
B.diffraction
C.refraction
D.regular reflection***
Are these all the right answers?Thanks for the help in advance.
Dude it's 2019 that stuffs been updated and has 25 questions someone post the answers.
Does is anyone know the answers just like abc
what did you get on the test
13) I think it is incorrect, I would need to check my sources and insites first, I will get back to you less than in an hour, :).
OK, BACK! I GOT THE ANSWERS, I earned a 20/23 on this, and I will now check your answers. By the way, I used my answers, not yours. I don't copy ewe...
1)Correct.
2)Incorrect, it uses absorption.
3)Correct, we went over this in my first post.
5)I picked Amplitude too, but its wrong, it was frequency.
6)We went over this, it was reflection. My answer, yours is incorrect though.
7)No, incorrect, they have SHORT wavelengths but HIGH frequency, (I got this right)
8) I got this correct, so did you, they do travel same in speed IF VACUM was the medium.
9) Correct, explained this in last post.
10) Correct, it transmits, I picked TRACKING though, I got it wrong, you got it right.
11)We talked about it, we both got it correct. So yes, you got it.
12) I got it right, you didn't though, they founded the process of RADIATION THERAPY. You should know this, key word radiation, since the fact is that they made up the term, 'RADIOACTIVITY'.
13) Wrong, it was incorrect, I got it right though, the answer was C.
14) Both got it right.
15) We both got it right.
Your score should be: 9/15. you have gotten 6 wrong.
Go back and go over questions, 2, 4, 6, 7, 12, and 13.
60%, D.
Not bad, lets get those answers in so we can get an A for you :D
This is all incorrect
Can someone post just the answers. Thanks for connexus. Thanks..Jacob What were they?
FR like we need the answers rn.
Things that are correct for a fact:
9) Correct, FM stands for frequency module and AM stands for amplitude module. They are named for what they receive.
3) Correct, absorption is the transfer of the energy of a wave to the particles within a medium that causes them to vibrate and generate heat.
6) Incorrect, Sonar is a system that uses REFLECTED sound waves to determine the distance of objects under water. Like sunken ships or schools of fish.
11) Correct. That was hypothesis before he did the experiement; though the incomes and outcomes of the project prohibited it to be true. Here is the story (thank my online school, connexus academy for this insite): In 1896, French physicist Henri Becquerel was experimenting with naturally fluorescent minerals to study the properties of X-rays. To do this, he would wrap two sheets of black paper around a photographic plate. Since the paper was opaque, light rays could not penetrate and damage the photographic plates underneath. Then he would place a mineral on top of the sheets of paper and place the entire apparatus in direct sunlight for several hours. Sometimes he would place a coin underneath the mineral. Becquerel expected the mineral to absorb solar energy, and then release X-rays that would create an image of the coin on the photographic plate like a modern medical X-ray.
One cloudy day, Becquerel wanted to repeat the experiment with a uranium mineral, but because there was no direct sunlight out, he placed the entire apparatus in a dark drawer, hoping the next day would be sunny. Since the weather conditions were unchanged the next day, Becquerel developed the photographic plates anyway, expecting to find a very weak image. To his surprise, the image on the plate was very intense! Becquerel repeated the experiment, making sure the uranium mineral did not absorb any light from an outside source. The same result occurred. Becquerel concluded that uranium was releasing radiation on its own, but he did not know why.