When light having vibrations with angular frequency ranging from 2.7×10^15rad/s to 4.7×10^15rad/s strikes the retina of the eye, it stimulates the receptor cells there and is perceived as visible light. what are the limits of the period of this light?

Explanation:

Given that,

Angular frequency 1,

Angular frequency 2,

When light having vibrations with angular frequency ranging from to strikes the retina of the eye, it stimulates the receptor cells there and is perceived as visible light. We need to find the limits of the period of this light.

We know that,

Time period,

So, the  limits of the period of this light is from to . Hence, this is the required solution.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.