Physics Plus Two.pdf - model question papers

12. You are sitting in a r6om in vihich a
'
13.
uniform magnetic field B exists. At
the cente of the room a charged
particle is suddenly projected
horizontally and il stans circular
motion in the horizontal plane.
(a) What should be the direction
of the magnetic field for this
to happen ? (l)
(b) Will there be a change in
kinetic energy of the Particle
due to this circular motion ?
Why ?
(l)
(c) A cyclotron uses a magnetlc
.field and an electric lield to
increase the . energy of a
charged particle. Describe its
construction and working. (3)
To emit a ftee electron from a metal
surface a minimum amount of
energy must tre supplied.
(a) This energy is called -
(b)
9015
(7')
State three methods to suPPlY
this energy to the ftee
elecfton..
(l%)
(c) When light of ftequencY
7.21 x l0la Hz is incident on a
metal surface, the ma-rdmum
. speed of the ejected electrons
is 6 x 105 rn/s. Calculate the
threshold frequencY for the
m€tal. (3)
12. n{'a'16,5otoc(o) 6l(0] ' a'cooil6,
o6rrDero B (rnelcril(fldoJ(m o(ol
oJ.ilo.jld c,l5sBon pokol(m].
oJdaolos o(Djr3c(.r)oro,l dfi;
oo)
ooorr'jJ.o a,6rDo "{O(oo))
Olod A@l
oilo('all(r) otel(oorloE 6o6gfJJ(m].
(a) @6!BorD ruoe.rll@ol(m(oil.d
@,cooild, o5rnDeiGroioae l31@
o4;CrOrCOr'lOlOOemo ? (1)
O) gq.ID (116(610,]9 de|(rto od,cfira
oooi€Jlo, @,6m('tdrlool
U)oilc4,cdesoto'lci ocgo
mJoGOfldOlCOC ?
"oclo}l
oo,c6tg ? (1)
(c) 6'o1 oo(Ddcgcalsc6rrild
ooorRJlo, 66m@IJg)Os 9'9(&
eeco oxiathil€ocd oo.lBlJo
o6rnDelor)o 6,cooil$ 06lTllr_
el(ulo 9dlcoc('ocsJ(dld))(ml.
ooal)dcgccLs'tmloal tets_
(rr(o)lo LdjolTEotD(r)o{o oilooo"l-
6,o:ldola,. (3)
13. 6r(0) cetc"o t"lorelo|oilo8 (rilcrtJ
perdcLsc5rDla,og m)@Lc.Docdocoa
5t(ol dluojlo' dl(ol6w'@
9.01aego aqfoal(roJ0c6ri.
(a) po g.cde-eotdnci
oO(mJ olocol(rD]
(b) gc g|'deeo o.e,cslatl.rDotct
(c)
(v,')
3 ocdgl6sBqa t"J(rdo)c.ril')ola,.(l%)
7.21 x l0!a Hz rorqoSoroil-
!o)gg LdJ6'c@o o@l ceJcdo
LoJoeioroiloi "loil.oolcallcq8
o{oorotl olo}.m PeldcLsc6ml-
6,glos 6Joocoj(|t GOJ(')OT
6 x 105 n/s croosmoilo8,
eeJc4ooDtootr oL('cdelc0irui
Grooljooil6,6m€ocdol6,. (3)
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