What part of the electromagnetic spectrum can be seen by humans?

Visible light

Explanation:

Electromagnetic spectrum is the classification of the electromagnetic waves based on their frequency and wavelength. In order from the shortest to the longest wavelength, we have

Gamma rays

X-rays

Ultraviolet

Visible light

Infrared radiation

Microwaves

Radio waves

All these waves are invisible to human eye, except for the visible light part. Visible light is perceived as a different color by the human eye, depending on the wavelength of the light. In particular, we have:

Violet: 380 - 450 nm

Blue: 450 - 495 nm

Green: 495 - 570 nm

Yellow: 570 nm - 590 nm

Orange: 590 nm - 620 nm

Red: 620 nm - 750 nm

the answer is d. 4

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also the more points you give the faster your questions get answered

the simple machine has three main features. they are:

fulcrum is the center point or pivot point of the machine. effort is input force/ applied force. load is external force/ output.

the keisha 's machine labels are

x : load

y: fulcrum

z: lever