Answer:
positive plate
E = 5.764 KV / m
W = 490eV or 7.85 * 10^-17 J
E_p = 4.74 *10^(-12) eV
E_k = 490 eV
Explanation:
part a
The potential difference between two plates = 490 V
Distance between two plates = 8.5 cm
Answer: The positive plate is at higher potential because of convention.
part b
Electric Field between the plates
E = V / d
E = 490 / 0.085 = 5.764 KV / m
Answer: Electric Field between the plates E = 5.764 KV / m
part c
Work done by electric field
W = V*q
W = 490 * 1.602*10^-19
W = 7.85 * 10^-17 J
or W = 490 eV
Answer: Work done by electric field W = 490eV or 7.85 * 10^-17 J
part d
Potential Energy of an electron gained:
E_p = m_e * g * d / (1.602*10^-19)
E_p = 9.109*10^-31* 9.81 * 0.085 / (1.602*10^-19)
E_p = 4.74 *10^(-12) eV
Very very small E_p approximately 0
Answer: Potential Energy of an electron gained E_p = 4.74 *10^(-12) eV or 0.
part e
Kinetic Energy of an electron gained:
W - E_p = E_k
E_k = 490eV - 4.74*10^(-12)eV
E_k = 490 eV
Answer: Kinetic Energy of an electron gained E_k = 490 eV
The sound wave will have traveled 2565 m farther in water than in air.
Answer:
Explanation:
It is known that distance covered by any object is directly proportional to the velocity of the object and the time taken to cover that distance.
Distance = Velocity × Time.
So if time is kept constant, then the distance covered by a wave can vary depending on the velocity of the wave.
As we can see in the present case, the velocity of sound wave in air is 343 m/s. So in 2.25 s, the sound wave will be able to cover the distance as shown below.
Distance = 343 × 2.25 =771.75 m
And for the sound wave travelling in fresh water, the velocity is given as 1483 m/s. So in a time interval of 2.25 s, the distance can be determined as the product of velocity and time.
Distance = 1483×2.25=3337 m.
Since, the velocity of sound wave travelling in fresh water is greater than the sound wave travelling in air, the distance traveled by sound wave in fresh water will be greater.
Difference in distance covered in water and air = 3337-772 m = 2565 m
So the sound wave will have traveled 2565 m farther in water than in air.
The critical thinking step has the student just completed
in the situation describe when the student concluded that soda intake really
does have an effect on their energy level is the analysis. This is because the student
observed the effects of drinking soda by his experience.
