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:
10.78 s
Explanation:
The force on the charge is computed by using the equation:

F = ma
∴



At time t(sec; the partiCle velocity becomes 
The velocity of the charge after the time t(sec) is expressed by using the formula:

Answer:
Weight
Weight ( ) is a force, measured in newtons ( ). Weight is caused by the pull of gravity acting on a mass, usually near the surface of a planet.
Explanation:
The speed of sound in gases is represented mathematically as:
v(sound) = √γRT/M
where γ = adiabatic constant which is the ratio of the heat capacities at constant pressure and constant volume; Cp/Cv
R = gas constant
T = temperature
M = molar mass of the gas
Hence, the speed of sound in gas is directly proportional to the square root of temperature.
Ans: c) temperature