Answer:
age of the site is 15411.75 years old
Explanation:
Given data
plant or animal dies = 14C
time period = 5730 year
carbon = 15.5%
to find out
age (in years) of the ancient site
solution
we know that Final value = Initial value ×
here n is half life passed
so for 15.5%
15.5% = 100% of
0.155 = 1 ×
now take log both side
log 0.155 = log
n = log 0.155 / log 0.5
n = 2.68966
we know here 5730 years in half life
so for 2.68966 half-lives = 2.68966 × 5730 = 15411.7518
age of the site is 15411.75 years old
Answer:
magnification = - 30
overall magnification = -240
Explanation:
given data
Focal length of microscope objective f = 0.150 cm
Object distance from microscope objective do = 0.155 cm
magnification by eyepiece = 8 ×
to find out
What magnification is produced and overall magnification
solution
we consider here Image distance from microscope objective is = di
so that
Magnification produced by objective will be = -
so we find here di by given equation that is
..................1
di = 4.65 cm
so that magnification by object will be
magnification = -
magnification = -
magnification = - 30
and
overall magnification will be
overall magnification = magnification by objective × magnification by eyepiece ........................2
overall magnification = -30 × 8
overall magnification = -240
Answer:
Explanation:
Force of attraction between two charges is 36N
Then from coulombs electrostatic law.
The force of attraction or repulsion between two charges (q1 and q2) is directly proportional to the product of the force and inversely proportional to the square of the distance apart.
F = kq1•q2 / r².
kq1•q2 / r² = 36
Now, we are told that the second charges has increased by a factor of 3
Then,
q2' = 3q2
So, since the first charge is contact, the radius is constant and k is constant,
Then,
F is directly proportional to the second charge, so if the second charge is triple then the force is tripled
Then,
F' = 3F = 3 × 36 = 108 units
Unit of force is newton
F' = 108N
Also,
F' = kq1•q2' / r²
F' = kq1•3q2 / r².
F' = 3 × kq1•q2 / r²
Since, kq1•q2 / r² = 36
Then,
F' = 3 × 36
F' = 108 units
F' = 108N