b. fresh water
c. air
d. cast iron
2. A wave has a wavelength of 10 mm and a frequency of 5 hertz. What is its speed?
a. 50 mm/s
b. 50 hertz/s
c. 2 mm/s
d. 0.50 mm/s
3. How does reflection differ from refraction and diffraction?
a. Reflection is the only process in which the wave does not continue moving forward.
b. Reflection is the only process that involves a change in the wave.
c. Reflection affects all types of mechanical waves, but refraction and diffraction do not.
Answer : 1. cast iron
2. 50 mm/s
3. Reflection is the only process in which the wave does not continue moving forward.
Explanation :
1. The speed of sound is greatest in solid. So, the speed of the sound is fastest in cast iron. It is approximately equal to 4600 m/s.
2. Wavelength, λ = 10 mm
Frequency, υ = 5 Hz
Speed = wavelength × frequency
Speed = 10 mm × 5 s⁻¹
Speed, s = 50 mm/s
3. The bouncing back of light is called the reflection of light. In this process, the wave does not continue moving forward.
1- CAST IRON
2- 50 mm/s
3- Reflection is the only process in which the wave does not continue moving forward.
In a covalent bond, valence electrons are shared; in an ionic bond, valence electrons are transferred.
B.
In a covalent bond, valence electrons are transferred; in an ionic bond, valence electrons are shared.
C.
In a covalent bond, outer electron orbitals are shared; in an ionic bond, outer electron orbitals are transferred.
D.
In a covalent bond, outer electron orbitals are transferred; in an ionic bond, outer electron orbitals are shared.
Answer:
Atoms form two types of bonds: ionic bond and covalent bond. In a covalent bond, valence electrons are shared; in an ionic bond, valence electrons are transferred.
Explanation:
Therefore, the answer is A
The answer;
In a conductor, the electric current can flow freely; in an insulator, it cannot flow freely.
Electrical conductance is the measure of the ease to pass an electric current through a material. Conductors usually have free electron in their bonds that enable them to carry electric current end to end. The higher the free electrons the higher the conddictivity. Insulators on the other and have no free electrons with this regard. Having free electrons in the structure is mainly determined by the electron configuration of the atoms of the element.
The correct statement is "In a conductor, electric current can flow freely; in an insulator, it cannot flow freely." The correct option is C.
A conductor is a material that allows the flow of electric current due to the presence of free electrons that can move easily. An insulator, on the other hand, is a material that restricts the flow of electric current because its electrons are tightly bound and cannot move freely.
A. Conductors have magnetic fields; insulators do not have magnetic fields.
This statement is not true. Both conductors and insulators can have magnetic fields, depending on the circumstances. The presence or absence of magnetic fields is not a defining characteristic that distinguishes conductors from insulators.
B. Conductors do not have magnetic fields; insulators do have magnetic fields.
This statement is also not true, for the same reasons mentioned above. Both conductors and insulators can have magnetic fields.
D. In a conductor, electric current cannot flow freely; in an insulator, it can flow freely.
This statement is the opposite of the correct option. In a conductor, electric current can flow freely because conductors have a large number of free electrons that are loosely bound to their atoms and are able to move easily in response to an electric field. In contrast, in an insulator, electric current cannot flow freely because insulators have tightly bound electrons that are not free to move, thus hindering the flow of electric current.
Therefore, option C is the correct one as it accurately describes the difference between conductors and insulators based on their ability to allow the flow of electric current.
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Answer:
Energy transformation is when energy changes from one form to another – like in a hydroelectric dam that transforms the kinetic energy of water into electrical energy. While energy can be transferred or transformed, the total amount of energy does not change – this is called energy conservation.
Explanation:
cause it is energy
magnetic field
magnetic domain
magnetic alignment