Select the sentences about the physical nature of light that are true. Check all that apply. Check all that apply. Blue light ha

Question

1 month ago

7

Select the sentences about the physical nature of light that are true. Check all that apply. Check all that apply. Blue light ha

s a wavelength of 750 nm, the longest wavelength of visible light, and red has a wavelength of 500 nm. Light is electromagnetic radiation, a type of energy embodied in oscillating electric and magnetic fields. The units of frequency are distance per second. The more closely spaced the waves, that is, the longer the wavelength, the more energy there is. Grass appears green because it reflects primarily the wavelength associated with green light and absorbs the others. Light in a vacuum travels at 3.00×108mph. Electromagnetic radiation can be characterized by wavelength, amplitude, and frequency. The presence of a variety of wavelengths in white light is responsible for the way we perceive colors in objects.

Physics

1 answer:

Softa [3K] · Answer 1 · 2026-04-06T12:57:40+03:00

Correct options:

- Blue light has a wavelength of 750 nm, the longest wavelength of the visible spectrum, while red light measures 500 nm. --> INCORRECT. In fact, blue light's wavelength is approximately 500 nm, and red light is around 750 nm, which represents the longest visible wavelength.

- Light is a form of electromagnetic radiation that consists of oscillating electric and magnetic fields. --> TRUE. Electromagnetic radiation consists of transverse waves characterized by electric and magnetic fields that oscillate at right angles to each other.

- Frequency is expressed in units of distance per second. --> INCORRECT. Frequency is quantified in Hertz (Hz), which reflects oscillations per second ( $s^{-1}$ .

- The closer the waves are together, meaning the longer the wavelength, the more energy they contain. --> INCORRECT. The energy of an electromagnetic wave is inversely related to its wavelength:

$E=\frac{hc}{\lambda}$

indicating that a longer wavelength equates to lower energy.

- Grass appears green due to its reflection of the wavelength associated with green light while absorbing others. --> TRUE. The perceived colors of objects correspond to the light they reflect, and other colors are absorbed by those objects.

- Light travels at 3.00×10^8 mph in a vacuum. --> INCORRECT. The units provided are wrong: the speed of light in a vacuum is $3.00\cdot 10^8 m/s$ .

- Electromagnetic radiation exhibits characteristics of wavelength, amplitude, and frequency. --> TRUE. Wavelength is the distance between two successive peaks, amplitude represents the greatest deviation of the wave from its resting position, and frequency indicates the number of oscillations each second.

- The variety of wavelengths present in white light accounts for the way we perceive colors in objects. --> TRUE. White light is comprised of multiple colors, and the colors we perceive depend on which are absorbed or reflected by an object.