The efficiency of a spray chamber scrubber is 95% for 20 μm particles. everything else being constant, what is the efficiency for 10 μm particles?
a. 48%
b. 53%
c. 78%
d. 95%

Answer : The correct option is, (a) 48 %

Explanation :

As we are given the efficiency of a spray chamber is, 95 %

Using unitary method :

If the efficiency of particles is 95 %

Then, the efficiency of particles will be =

Therefore, the efficiency for particles is, 48 %

it would be d. henry moseley

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(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied