In a double-slit experiment the distance between slits is 5.0 mm and the slits are 1.4 m from the screen. two interference patterns can be seen on the screen: one due to light of wavelength 460 nm, and the other due to light of wavelength 650 nm. what is the separation in meters on the screen between the m = 2 bright fringes of the two interference patterns?

Explanation:

It is given that,

Distance between the slits, d = 5 mm = 0.005 m

Distance between slit and screen, D = 1.4 m

For m = 2, and

For m = 2, and

Separation between two fringes is :

Hence, this is the required solution.

double the distance = divide strength by 4

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.