your MC answers? (2 Viewers)

[iStudent]

1 more than me. I got 18. (we got the same in chem too lol)

 

[orcevalm]

can someone explain 17? i got it right but i still dont get it hah

 

[danielblarg]

20 is C

Pretty sure its D. 19.6 Is the horizontal and vertical component of the velocity, so v=sqrt(2*(19.6)^2)=27.7

 

[danielblarg]

can someone explain 17? i got it right but i still dont get it hah

F=Eq, ma=Eq, a=Eq/m. The alpha particle has twice the charge, 4 times the mass, so acceleration is half.

 

[wagig]

Pretty sure its D. 19.6 Is the horizontal and vertical component of the velocity, so v=sqrt(2*(19.6)^2)=27.7

Yeah you're right. My mistake.

 

[orcevalm]

F=Eq, ma=Eq, a=Eq/m. The alpha particle has twice the charge, 4 times the mass, so acceleration is half.

ohh ok thanks!!

 

[theodore0307]

can someone explain 17? i got it right but i still dont get it hah

what's 17

 

[anomalousdecay]

someone link the paper

 

[duckysd]

Answer for 17 is 1/2.

 

[Fizzy_Cyst]

Answer for 17 is D.
Uniform electric field implies constant force.
Alpha particle ~4amu
Proton ~1amu
Since f = m*a, and is constant, alpha particle mass is 4* proton, therefore it's acceleration is 1/4 of proton.

Nep.

Charge of alpha particle is twice charge on proton, so acceleration ends up as 1/2

F = ma
F = qE
qE = ma

a = qE/m

 

[duckysd]

Nep.

Charge of alpha particle is twice charge on proton, so acceleration ends up as 1/2

F = ma
F = qE
qE = ma

a = qE/m

Damn. You're correct.
I'll edit my response to clear confusion.