Chapter 17.1 Electromagnet Waves Have Unique Traits

Explanation
Electromagnetic waves transfer energy. Electromagnetic waves are composed of electric and magnetic fields that oscillate perpendicular to each other and propagate through space. As they travel, these waves carry energy from one place to another. This energy can be in the form of light, heat, or other types of electromagnetic radiation. Electromagnetic waves are used in various applications such as communication, heating, and imaging.

Explanation
An EM wave is a combination of an electric field and a magnetic field. These fields are perpendicular to each other and both are essential components of an electromagnetic wave. The electric field is responsible for the electric force experienced by charged particles, while the magnetic field is responsible for the magnetic force. Together, these fields propagate through space as an electromagnetic wave, carrying energy and information.

Explanation
When electromagnetic waves encounter a medium, they can transfer energy. This is because electromagnetic waves consist of oscillating electric and magnetic fields, and when they interact with particles in a medium, they can transfer their energy to those particles. This energy transfer can result in various effects, such as heating the medium or causing it to vibrate. Therefore, the statement that electromagnetic waves can transfer energy when encountering a medium is correct.

Explanation
An electromagnetic wave is a disturbance that transfers energy through a field. This field refers to the electromagnetic field, which consists of electric and magnetic fields that oscillate perpendicular to each other and propagate through space. These waves can travel through a vacuum or a medium and are generated by the acceleration of charged particles. The energy carried by electromagnetic waves can be harnessed for various purposes, including communication, heating, and lighting.

Explanation
The electric wave is perpendicular to the magnetic field, meaning that they are at a 90-degree angle or right angle to each other. This relationship is a fundamental principle in electromagnetism known as the right-hand rule. According to this rule, when a current flows in a wire, a magnetic field is produced around it, and the direction of this magnetic field is perpendicular to the direction of the current flow. Therefore, the electric wave, which is associated with the current, is also perpendicular to the magnetic field.

Explanation
The Sun is the main source of electromagnetic waves that provide energy for the environment on Earth. These waves, including visible light, ultraviolet rays, and infrared radiation, are emitted by the Sun and are crucial for various processes on Earth such as photosynthesis, climate regulation, and the water cycle. The energy from the Sun is absorbed by plants, animals, and the atmosphere, sustaining life and driving weather patterns.

Explanation
Electromagnetic waves can travel in a vacuum because they do not require a medium to propagate. Unlike mechanical waves, such as sound waves, which need a material medium to travel through, electromagnetic waves consist of oscillating electric and magnetic fields that can travel through empty space. This property allows electromagnetic waves, including light, radio waves, and X-rays, to travel through the vacuum of outer space.

Explanation
Energy that moves in the form of electromagnetic waves is called radiation. Radiation refers to the transfer of energy through electromagnetic waves, such as radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. These waves carry energy from a source to a receiver without the need for a medium, making radiation a form of energy that can travel through a vacuum.

Explanation
Electromagnetic waves are different than mechanical waves because they do not require a medium to propagate through. Mechanical waves, on the other hand, require a physical medium such as air, water, or solids to travel. Electromagnetic waves can travel through vacuum, such as in outer space, whereas mechanical waves cannot. Additionally, electromagnetic waves consist of oscillating electric and magnetic fields, while mechanical waves involve the transfer of energy through the vibration or oscillation of particles in a medium.

Explanation
The speed of electromagnetic waves in a vacuum is 300,000 kilometers per second.

Explanation
A mechanical wave converts potential energy into kinetic energy by moving the medium back and forth. The medium refers to the substance or material through which the wave travels, such as air, water, or a solid object. As the wave passes through the medium, it transfers energy to the particles of the medium, causing them to vibrate or oscillate. This vibration of the particles results in the conversion of potential energy, which is stored energy, into kinetic energy, which is the energy of motion. Therefore, the medium plays a crucial role in the conversion of energy in mechanical waves.

Explanation
EM waves occur when electrically charged particles move. This movement of charged particles creates a changing electric field, which in turn generates a changing magnetic field. The interaction between these changing electric and magnetic fields produces electromagnetic waves. These waves can travel through space and carry energy from one place to another. Therefore, the given answer "charged" correctly explains that EM waves occur when electrically charged particles are in motion.