You take 3 steps east, turn around & take another 7 steps west (4 steps always from origin) you turn around again and take 6 more steps east - 2 steps always from origin
The angles of incidence with respect to the normal will the x-rays reflect from the crystal will be
16.60 degrees. Given: wavelength of X-rays, λ= 0.120 nm
Distance, d=0.21 nm
According to Bragg’s diffraction law: nλ = 2dsinθ
thus, 0.120 = 2*0.21sinθ
or θ =
(0.120/2*0.21)
or θ = 16.60 degrees.
As per Newton's law when unbalanced force is acting on the object

so acceleration of the object is given as

since object is accelerating here so we can say that due to unbalanced force there must be change in velocity of the object
So correct answer regarding change in velocity must be given as
<u>3. Decelerate
</u>
<u>4. Stop moving
</u>
<u>5. Accelerate
</u>
<u>7. Start moving</u>
A.The hiker had an easy, level trail from 11:00-12:00 and was able to travel the fastest during that time period.---> may be because this was indeed fastest stage
b.The hiker got tired and walked the slowest from 1:00-2:00.---> no, because this was not the slowest stage
c.The hiker stopped for lunch from 11:00-12:00 and that slowed him down.---> no because this was the fastest stage
d.The hiker ended up in the same place that he started.---> no, because the hiker walked more toward east than toward west and more toward south than toward north.
Answer: option a)