Yellow is a warm, high energy color. Green is a cool calming color.
It depends on the context. In terms of wavelength, green light typically has a higher frequency than yellow light because it has a shorter wavelength. However, in everyday life, yellow light is more commonly observed and used in various lighting sources, so it may have a higher frequency of occurrence.
Green
When you mix green and yellow together, you get the color called "yellow-green."
Yellow is a primary color and green is a secondary color. When these two are mixed you will get a tertiary color which is yellow-green or light green.
Mixing green and yellow will create the color of lime green.
Yellow green is a tertiary color. Yellow and green mix in equal parts to make yellow-green. You can also mix 1 part blue and 3 parts yellow to make yellow-green.
When green is mixed with yellow, the color created is typically a shade of yellow-green.
Green is the color green. You can get green by mixing yellow and blue.
Green light. If you use the abbreviation ROY G. Biv ( red, orange yellow, green, blue, indigo, violet), you will always know that the red light has the longest wavelength and violet has the smallest wavelength. Wavelength and frequency are inversely proportional to one another. So if the wavelength is large, frequency is small, and when wavelength is small, frequency is large. Green light has a smaller wavelength than yellow. Likewise it has a higher frequency than yellow does. Therefore, green light has a higher frequency than yellow light.
Yellowish Green looks like neon green color with out the neon glow. Sort of pastel.
When green and yellow are mixed together, the color produced is typically a shade of yellow-green.
Blue and yellow = green