Lithium shares more properties with Sodium, because they have the same number of valence electrons (one). Choice 1 is correct. Hope this helps!
Measure a whole stack (one in which you know the number of sheets), then divide your measurement by the number of sheets in that stack
Answer:
2.1 s
Explanation:
The motion of the ball is a projectile motion. We know that the horizontal range of the ball is
And that the initial speed of the ball is
at an angle of
So, the horizontal speed of the ball (which is constant during the entire motion) is
And since the horizontal range is 50 m, the time taken for the ball to cover this distance was
which is the time the ball spent in air.
Answer:
Explanation:
When standing sound wave is produced in a medium , distance between anti-node and next node is equal to a quarter of a wave length. Node is point of silence where sound intensity is zero or minima.
wave length = velocity / frequency
= 340 / 85
= 4 m
We must move by a distance of 4/4 = 1 m away from wall
to find the first quiet spot.
