Answer
613.63Hz
Explanation:
Fobs = (V/V-Vsource)Force
V=speed of sound
Fobs= (343/343-18.8)580
Fobs= 613.63Hz
Fobs = frequency observed
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Answer:
Explanation:
more the density , more will be the buoyant force acting on it , less the density less will be the buoyant force acting on it. This is why people float in dead sea and sink in other seas
Answer:
Let the second medium be air (n₁=1)
The refractive index n₂ of the medium where first medium is air is found (a)
(a) n₂ = 2
Explanation:
Critical angle can be defined as the angle of incidence that provides the angle of refraction of 90°.
Refractive index of a medium can be defined as a number that describes that how fast a light will travel through that medium.
Critical angle and Refractive index are related by:


To find refractive index of medium with respect to air, substitute n₁=1 (Refractive index of air is 1)
Also θ(critical)=30°
Find n₂ :


Explanation:
At the top of the tree, the velocity of the pebble is purely horizontal so we can calculate it as

