Answer:
The power of lens is 2.22 D.
Explanation:
Given that,
Distance of image v= 45 cm
We know that,
Distance of object u= ∞
Power of lens is the reciprocal of focal length.
We need to calculate the power of lens
Using formula of lens
Where, f = focal length
v = image distance
u = object distance
Put the value into the formula
Hence, The power of lens is 2.22 D.
Answer:
Explanation:
The kinetic energy of a rigid body that travels at a speed v is given by the expression:
The equivalence between mass and energy established by the theory of relativity is given by:
This formula states that the equivalent energy can be calculated as the mass multiplied by the speed of light squared.
Where is approximately
Hence:
Therefore, the ratio of the person's relativistic kinetic energy to the person's classical kinetic energy is:
Answer:
A
Explanation:
An ion with a negative charge
Answer:
c. Ф increases and E decreases
Explanation:
From Gauss's Law
Ф = Q / ε₀ _____(1)
The electric flux Ф is the surface integral of electric field E
Ф _____(2)
|E| = Q/ 4πε₀r² _____(3)
Where,
Φ is the electric flux through a closed surface S enclosing any volume V
E is the electric field
dA is a vector representing an infinitesimal element of area of the surface
Q is the total charge enclosed within V, and
ε₀ is the electric constant
Considering the relationship between equation 1, 2 and 3, If the charge, Q, is doubled and the radius, r, of the surface is also doubled; the electric flux Φ increases and electric field E decreases. From Gauss law in equation 1, the electric flux Φ is directly proportional to the charge, Q, with ε₀ being a constant. An increase in charge will cause an increase in electric flux. Also, the electric field, will decrease because of the inverse relationship between radius and electric field.