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
1). C
2). A
3). C
4). B
5). D
6). A
7). D
8). B
9). C
10). B
11). B
12). C
13). C
14). D
15). D
Why don't you repost and star those answers at the question. This scrolling up and down a half dozen times for each question takes too long. I agree with answers to 1 and 2.
Check my answers pls
1. A. frequency and wavelength
2. A. absorption
3. C. absorbed
4. B. wavelength and wave speed
5. D. frequency
6. A. sound waves can reflect
7. D. short wavelength and high frequency
8. B. They all travel at the same speed
9. C. the frequency of the wave
10. B. to transmit signals
11. B. fluorescent minerals needed direct sunlight to produce X-rays
12. C. the discovery of radiation therapy
13. C. Radioactive elements near the core release heat as their nuclei decay
14. D. the properties of the medium it travels through
15. D. regular reflection
1) The properties of waves being described by the weatherman are: amplitude and wavelength. To determine this, we can look at the given information that the storm waves are about 2 meters high (which indicates the amplitude) and about 35 meters apart (which indicates the wavelength). Therefore, the correct answer is C) amplitude and wavelength.
2) Soundproof rooms take advantage of the property of waves called absorption. This is because sound waves are absorbed by the materials used to construct the room, preventing the sound from being transmitted or reflected. Therefore, the correct answer is A) absorption.
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 absorbed. This is because absorption refers to the process of a wave's energy being taken in by a medium and converted into another form, such as heat. Therefore, the correct answer is C) absorbed.
4) There is no question number 4 in your list.
5) The property of a sound wave that changes as the fire truck goes by is frequency. The pitch of a sound is determined by its frequency - higher frequencies correspond to higher pitches, while lower frequencies correspond to lower pitches. As the fire truck moves away from you, the frequency of the siren decreases, resulting in a lower pitch. Therefore, the correct answer is D) frequency.
6) Sonar takes advantage of the fact that sound waves can reflect. Sonar systems emit sound waves into water and then listen for the echoes that bounce back. These echoes allow the system to create a map of underwater objects or structures. Therefore, the correct answer is A) sound waves can reflect.
7) Gamma rays have a short wavelength and high frequency. Gamma rays are a form of electromagnetic radiation with the shortest wavelengths and highest frequencies, making them the most energetic type of electromagnetic wave. Therefore, the correct answer is D) short wavelength and high frequency.
8) All electromagnetic waves in a vacuum travel at the same speed. According to Maxwell's equations, which describe the behavior of electromagnetic waves, the speed of an electromagnetic wave in a vacuum is constant and equal to the speed of light (approximately 3 × 10^8 meters per second). Therefore, the correct answer is B) they all travel at the same speed.
9) FM signals travel as changes in the frequency of the wave. FM stands for frequency modulation, which means that the frequency of the wave carrying the signal is varied to encode information. This allows for different frequencies to represent different audio signals. Therefore, the correct answer is C) the frequency of the wave.
10) The principle role of a tower within a cellular system is to transmit signals. Cellular towers, also known as cell towers or base stations, are the infrastructure used in wireless communication networks. They receive and transmit signals to and from mobile devices, ensuring the connectivity and coverage of the cellular network. Therefore, the correct answer is B) to transmit signals.
11) Henri Becquerel expected to see only weak images on the photographic plate containing the uranium salt because he thought fluorescent minerals needed direct sunlight to produce X-rays. This shows a misunderstanding of the nature of radioactivity. Becquerel believed that the fluorescent minerals in the uranium salt needed direct sunlight to emit X-rays and expose the photographic plate. However, he later discovered that the emission of X-rays was not dependent on sunlight but on the radioactive properties of the uranium salt itself. Therefore, the correct answer is B) fluorescent minerals needed direct sunlight to produce X-rays.
12) Marie and Pierre Curie noticed burns on their fingers after handling test tubes containing radioactive substances. This observation led to the discovery of radiation therapy. The burns were caused by exposure to the high-energy radiation emitted by the radioactive substances, which prompted the Curies to explore the potential use of this radiation for medical purposes, leading to the development of radiation therapy for treating cancer and other diseases. Therefore, the correct answer is C) the discovery of radiation therapy.
13) Radioactivity makes it possible to understand how Earth can be so old and still have a hot interior because radioactive elements near the core release heat as their nuclei decay. Radioactive isotopes, such as uranium, thorium, and potassium, are present in Earth's interior. As these isotopes decay, they release energy in the form of heat. This ongoing process of radioactive decay contributes to the heat that keeps Earth's interior hot. Therefore, the correct answer is C) radioactive elements near the core release heat as their nuclei decay.
14) The speed of sound depends on the properties of the medium it travels through. Sound waves require a medium to propagate, such as air, water, or solids. The speed at which sound travels depends on the density and compressibility of the medium. For example, sound travels faster in solids than in liquids, and faster in liquids than in gases. Therefore, the correct answer is D) the properties of the medium it travels through.
15) The property of light demonstrated when the image of a mountain can be seen on the surface of calm water is regular reflection. Regular reflection occurs when parallel rays of light hit a smooth surface and bounce off in a uniform manner, forming a clear and undistorted image. In this case, the smooth surface of the calm water acts as a mirror, reflecting the light rays and allowing the image of the mountain to be seen. Therefore, the correct answer is D) regular reflection.