Astronomy Test Chapter 6

Sound is not a type of electromagnetic wave because it is a mechanical wave that requires a medium, such as air or water, to propagate. Electromagnetic waves, on the other hand, can travel through empty space and do not require a medium. Therefore, sound does not belong to the category of electromagnetic waves.

Visible light is the part of the electromagnetic spectrum that we can see. It consists of the colors that are visible to the human eye, ranging from red to violet. Infrared light and ultraviolet light, on the other hand, are not visible to the naked eye. Infrared light has longer wavelengths than visible light, and ultraviolet light has shorter wavelengths. Therefore, the correct answer is visible light.

Frequency refers to the number of cycles or vibrations per second in a wave. It represents the rate at which the wave oscillates or repeats itself. Amplitude, on the other hand, refers to the maximum displacement of a wave from its equilibrium position. Period is the time taken for one complete cycle of a wave, while wavelength is the distance between two consecutive points in a wave that are in phase. Therefore, frequency is the correct answer as it specifically relates to the number of cycles or vibrations per second in a wave.

The electromagnetic spectrum is a range of electromagnetic waves that vary in frequency and wavelength. The correct sequence of the electromagnetic spectrum in order of decreasing frequency is gamma ray, x-ray, ultraviolet, visible, infrared, microwaves, and radio waves. Gamma rays have the highest frequency, followed by x-rays, ultraviolet, visible light, infrared, microwaves, and radio waves with the lowest frequency.

The visible light spectrum consists of different colors arranged in order of decreasing frequency. Violet has the highest frequency, followed by indigo, blue, yellow, orange, and red. This sequence is correct because it follows the pattern of colors in the visible light spectrum, with each color having a lower frequency than the one before it.

The speed of electromagnetic waves is the same regardless of the frequency. This means that whether the wave has a high or low frequency, it will still travel at the speed of light.

Visible light has the highest frequency among the given types of light. This is because the frequency of light is directly proportional to its energy. As we move from radio waves to visible light, the frequency increases, indicating higher energy levels. Visible light falls within the range of the electromagnetic spectrum that is detectable by the human eye, and it is responsible for the colors we perceive.