Alight beam travels at 1.94×108 in quartz. the wavelength of the light in quartz is 355 .part awhat is the index of refraction of quartz at this wavelength? part bif this same light travels through air, what is its wavelength there?

A) 1.55

The speed of light in a medium is given by:

where

is the speed of light in a vacuum

n is the refractive index of the material

In this problem, the speed of light in quartz is

So we can re-arrange the previous formula to find n, the index of refraction of quartz:

B) 550.3 nm

The relationship between the wavelength of the light in air and in quartz is

where

is the wavelenght in quartz

is the wavelength in air

n is the refractive index

For the light in this problem, we have

Therefore, we can re-arrange the equation to find , the wavelength in air:

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.