Answer:
Plane spacing, 
Explanation:
It is given that,
Wavelength of x-ray, 
Angle the x-ray made with a set of planes in a crystal causing first order constructive interference is 30 degrees
We need to find the plane spacing. It is based on Bragg's law such that,

d is plane spacing
n = 1 here

So, the plane spacing is
.
<span>This is an agrarian society, taken to its extreme. These societies are largely dependent upon farming and related activities as a way of earning income, and also for using the farmed items as a way of supporting oneself as food and clothing.</span>
Answer: All of our energy comes from the sun, which is our nearest star. The sun sends out huge amounts of energy through its rays every day. We call this energy solar energy or radiant energy. Without the sun, life on earth would not exist, since our planet would be totally frozen.
Explanation:
Here,
Velocity of A=60km/hr
Velocity of B=80km/hr
Now,
Relative velocity of B with respect to A in the same direction=Velocity of B - Velocity of A
=80km/hr-60km/hr
=20km/hr
Answer:
The answer is a prism
Hope it helps...............