Question

please help me with this question.​

Answer 1

Answer:

${ { {)265}^{ \sqrt{?} } }^{2} }^{?}$

Answer 2

Answer:

a)let the distance between the cliff and boy be d.

Total distance traveled by the sound wave=2d (its 2d as it reaches the cliff travelling distance d and after reflection at the cliff is comes back to the boy travelling d, so totally its 2d)

the speed of sound in air=340m/sec

time taken by echo to reach the boy=2sec

we know that speed=distance(s)/time(t) ; lets put the values

340=2d/2

340=d

d=340m

∴The cliff is 340m away from the boy.

b)A basic law of magnetism is that unlike poles attract each other. Two bar magnets can illustrate this. ... A pole of the second is brought, in turn, near each of the two ends of the hanging magnet. One end of the hanging magnet is attracted.