Energy And Waves Quiz Questions And Answers

Illuminated objects reflect light. When light falls on an object, it interacts with the surface of the object. The surface either absorbs the light, reflects it, or transmits it. In the case of illuminated objects, they reflect the light that falls on them, causing them to be visible to our eyes. This reflection of light allows us to see the object and perceive its color, shape, and texture.

The higher the frequency of a sound wave, the higher the pitch. This is because pitch is determined by the frequency of the sound wave. A higher frequency means that the sound wave is vibrating at a faster rate, resulting in a higher pitch. The term "bigger" is not applicable in this context as it does not accurately describe the relationship between frequency and pitch.

Mechanical waves require a medium to propagate because they rely on the vibration and movement of particles in a substance to transfer energy. Examples of mechanical waves include sound waves, water waves, and seismic waves. In contrast, electromagnetic waves do not require a medium and can travel through vacuum, such as light waves and radio waves.

The law of conservation of energy states that energy cannot be created nor destroyed, but it can change forms. This means that the total amount of energy in a closed system remains constant over time. Energy can be converted from one form to another, such as from potential energy to kinetic energy or from thermal energy to mechanical energy. This principle is fundamental to understanding and explaining various phenomena in physics and is a cornerstone of the field.

When the amplitude of a sound wave is higher, it means that the wave has a greater height or intensity. This results in a louder sound because the increased amplitude causes more air particles to be displaced, creating a stronger and more intense sound wave. Therefore, the correct answer is "louder".

A sound wave is a longitudinal wave. In a longitudinal wave, the particles of the medium vibrate parallel to the direction of wave propagation. In the case of sound, the particles of the medium (such as air molecules) vibrate back and forth in the same direction as the sound wave travels. This type of wave is different from a transverse wave, where the particles of the medium vibrate perpendicular to the direction of wave propagation.

It is like stepping stones. Since the atoms are closer together it is easier to "walk"

Gamma rays have the smallest wavelength in the electromagnetic spectrum. They have the highest frequency and carry the most energy among all the electromagnetic waves. Gamma rays are produced by radioactive atoms and nuclear reactions. They have various applications in medicine, industry, and research, such as cancer treatment and sterilization.

An orange appears orange because all the colors are being absorbed except orange which is being reflected. When white light hits an orange, the orange pigment absorbs all the colors of light except for orange. The orange wavelength of light is reflected off the surface of the orange, allowing our eyes to perceive it as the color orange.

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The burning of lumber and dung is classified as biomass energy. Biomass refers to organic matter, such as plants or animal waste, that can be burned to produce heat or electricity. In this case, the lumber and dung are being burned to release energy in the form of heat. Biomass energy is considered renewable because it comes from organic materials that can be replenished, unlike fossil fuels which are finite resources.

Refraction refers to the bending of light when it passes from one medium to another, which occurs due to the change in its speed. This phenomenon is responsible for various optical effects, such as the apparent bending of a straw in a glass of water. Therefore, option b and c, which state that refraction is when waves move at different speeds due to traveling in different mediums and when light bends, are both correct explanations of refraction.

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