Monochromatic light with a wavelength of 6.4 e -7 meter passes through two narrow slits, producing an interference pattern on a screen 4.0 meters away. the first order bright band lines are 2.0 e -2 meters away from the central bright maxima.
what is the distance between the slits?

The distance between the slits is .

Explanation:

Given that,

The wavelength of the monochromatic light

Distance = 4.0 m

Width

Using formula of the distance between the slits

Where, x = distance from central fringe

D = Distance between the slit and screen

d = distance between the slits

n = number of order

=wavelength

Put the value into the formula

Hence, The distance between the slits is .

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.