Answer: 3750 m
Explanation:
1) You can find in the literature or internet that the speed of sound in the ocean is about 1500 m/s.
2) Then, you can find the distance travel by the sound wave in 5.0s with the equation distance = speed × time
⇒ distance = 1500m/s × 5.0 s = 7500 m
3) That sound went down until the ocean floor below and cameback all the way until the sailor heard it.
Then, the deep of the ocean fllor is half that distance:
deep = 7500m / 2 = 3750m
Resistance = voltage / current
Resistance = 63 / 4
Resistance = 15.75 ohms
Secondary wave is the answer
Complete Question
The complete question is shown on the first uploaded image
Answer:
A
B
C
The correct option is B
Explanation:
From the question we are told that
The refractive index of water is 
The refractive index of ethanol is 
Generally the threshold velocity for creating Cherenkov light from a charged particle as it travels through water is mathematically evaluated as
Where c is the speed of light with value 
Generally the threshold velocity for creating Cherenkov light from a charged particle as it travels through water is mathematically evaluated as
=> 
=>
Answer:
a. Both wires have the same resistivity
Explanation:
For the resistance of a wire , following formula holds good .
R = ρ l / S , R is resistance , l is length , S is cross sectional area and ρ is resistivity of the material that the wire is made of. Resistance is dependent on length and cross sectional area but resistivity does not depend upon length or cross sectional area . It only depends upon the type of material.
If we replace copper wire with aluminium wire , then resistivity will change .
Hence , since the wire remains made of copper , resistivity will not change.
