In the spectrum of visible light, the red light has _________ wavelength and ________frequency. 

The energy contained in each wave in the visible light spectrum is proportional to its frequency. The frequency of a wave increases with its energy, and vice versa.
The region of the electromagnetic spectrum that is visible to the human eye is known as the visible spectrum. This wavelength range of electromagnetic energy is referred to as visible light or just light. The visible spectrum includes light with wavelengths ranging from 740 nm for red light to 380 nm for violet light. Compared to violet, ultraviolet has shorter wavelengths.
Magnetic spectrum seen in the following illustration:

The definition of light wave energy in terms of electromagnetic radiation is:
$E=hf$
Where,
The frequency of light is denoted by f.
E represents the energy of the light wave.
The Planck's Constant is denoted by h.
And light wave velocity is defined as:
$v=\lambda f$
and the wavelength of light waves is indicated by the above equation as:
$\lambda =\frac{v}{f}-{}^{-1}-^{\left(3\right)}$
where,
$\lambda$ is wavelength of linht waves

The speed of light waves is V.
Here, the first equation indicates that the light is a wave, while the second equation indicates that the light is a particle.
The frequency of red light drops as wavelength grows according to equation, as shown in the above figure when the wavelength of red light is larger (3). Compared to other visible spectrum he , red light has less energy.
So, the red color of light has the largest wavelength and the smallest frequency in the visible spectrum of light.

Hence, the correct answer is option B.