Abeam of microwaves with λ = 0.9 mm is incident upon a 9 cm slit. at a distance of 1.5 m from the slit, what is the approximate width of the slit's image (cm)?

3 cm

Explanation:

According to the question,

.

.

.

Now the approximate slit's image width is equal to width of central maxima.

And width of central maxima is twice the width from center to first maxima

So,

.

Substitute all the variable in above equation.

.

.

real, smaller and upside-down.   so the answer should be b.

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force