An electrostatic precipitator has collecting plates 3 m tall 1 m long in the direction of flow. the spacing between the charging electrode and the collecting plate is 7.56 cm. the device is to be used to collect particles having a dielectric constant of 4 and an effective diameter of 4 um. the carrier gas (air at 25 °c) has a velocity of 1.2 m/s. calculate the collection efficiency for a charging voltage of (a) 10 kv, (b) 20kv, (c) 30kv, (d) 40kv and (e) 50kv. omit the cunningham correction

there is no correct list among the choices you've provided.

the list might look something like this:

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-- trumpet

-- tenor singer

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can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s

thermal energy is the answer