Oi mate 3 electrons will be in tha 2nd energy level you silly willy.
Answer:
Phase contrast microscope
Explanation:
It is used for viewing biological structures not visible under the microscope. It is used for viewing microrganisms live
Answer:
r = 1.44 ×
m
Explanation:
given data
satellite to revolve = 5 time a day
G = 6.67 ×
Nm²/kg²
Mass earth = 5.97 ×
kg
to find out
radius of its orbit
solution
first we get here Time taken for one complete revolution that is
time taken = 
time taken = 4.8 hours
time taken = 4.8 hours × 3600 sec
time taken = 17280 sec
and
time is express as
T = 2π ×
.............1
put hre value we get
17280 = 2π × 
solve it we get
r = 1.44 ×
m
As shown in the figure, the ideal mechanical advantage is calculated by dividing the radius of the wheel by the radius of the axle. Any crank-operated device is an example of a wheel and axle. Force applied to a wheel exerts a force on its axle.