Answer:
16 cm
Explanation:
For protons:
Energy, E = 300 keV
radius of orbit, r1 = 16 cm
the relation for the energy and velocity is given by

So,
.... (1)
Now,

Substitute the value of v from equation (1), we get

Let the radius of the alpha particle is r2.
For proton
So,
... (2)
Where, m1 is the mass of proton, q1 is the charge of proton
For alpha particle
So,
... (3)
Where, m2 is the mass of alpha particle, q2 is the charge of alpha particle
Divide equation (2) by equation (3), we get

q1 = q
q2 = 2q
m1 = m
m2 = 4m
By substituting the values

So, r2 = r1 = 16 cm
Thus, the radius of the alpha particle is 16 cm.
Answer:
The average induced emf in the loop is 0.20 V
Explanation:
Given:
Radius of loop
m
Magnetic field
T
Change in time
sec
According to the faraday's law,
Induced emf is given by

Where
magnetic flux
( here
)
Where 
We neglect minus sign because it's shows lenz law


V
Therefore, the average induced emf in the loop is 0.20 V
Answer:
the capacitor voltage is V = 20 V
Explanation:
Given,
Capacitance of the capacitor = 2.0 μF
energy stored = 200 W
time (t) =2.0 μs
Capacitor voltage = ?



we know,




V = 20 V
so , the capacitor voltage is V = 20 V
Answer:
71 % of the earth's surface is covered in water
Answer:
she's wrong because she is and there it doesn't say she's right