1.!(1)!A!hiker!determines!the!lengt h!of!a!lake!by!listening for!the!echo!of!her!shout!reflected !by!a! cliff!at!the!far!end of!the!lake.!She!hears!the!echo!2.0 !s!after!shouting.!Estimate the!length!of!the! lake.

The length of the lake is 340 meters.

Explanation:

It is given that, a hiker determines the length of a lake by listening for the echo of her shout reflected by a cliff at the far end of the lake. She hears the echo 2 s after shouting. We need to find the length of the lake.

The distance covered by the person in 2 s is :

v is the speed of sound

The length of the lake is given by :

l = 340 meters

So, the length of the lake is 340 meters. Hence, this is the required solution.

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

grav potential energy