+2 puli physi s answer key ‘19 21. laser characteristics ... · 12.03.2019 · +2 puli physi s...
TRANSCRIPT
A. ABIDHA BEGUM , PG ASSISTANT, GOVT GIRLS HR SEC SCHOOL, PUGALUR KARUR DIST(P.N. 1)
+2 PUBLIC PHYSICS ANSWER KEY ‘19
Part II
16. dipole moment &unit
The dipole moment is the product of the
magnitude of the one of the charges and the
distance between them. p = q2d. The unit of
dipole moment is C m.
17. ohms law
At a constant temperature, the steady
current flowing through a conductor is
directly proportional to the potential
difference between the two ends of the
conductor. ( i.e.) I ∝ V or V = IR
18. peltier coefficient
The amount of heat energy absorbed or
evolved at one of the junctions of a
thermocouple when one ampere current
flows for one second (one coulomb) is called
Peltier coefficient. It is denoted by π. Its unit
is volt.
H = π It
19. de morgans theorem
First theorem: “The complement of a sum is
equal to the product of the complements
𝐴 + 𝐵̅̅ ̅̅ ̅̅ ̅̅ = �̅�. �̅�
Second theorem: “The complement of a
product is equal to the sum of the
complements.” 𝐴. 𝐵̅̅ ̅̅ ̅ = �̅� + �̅�
20. uses of IR
(i) Infrared lamps are used in physiotherapy.
(ii) Infrared photographs are used in
weather forecasting.
(iii) IR radiations are not absorbed by air,
fog, mist , they are used to take photograph
of long distance objects.
(iv) Infrared absorption spectrum is used to
study the molecular structure
21. laser characteristics
The laser beam i) Is monochromatic.
ii) Is coherent, with the waves, all exactly in
phase with one another,
iii) Does not diverge at all and
iv) Is extremely intense.
22. 𝝀 =𝒉
√𝟐𝒎𝑬𝒌 𝝀′ =
𝒉
√𝟐𝒎𝟒𝑬𝒌=
𝒉
𝟐√𝟐𝒎𝑬𝒌=
𝝀
𝟐
23. curie
Curie : Curie is defined as the quantity of a
radioactive substance which gives 3.7 × 1010
disintegrations per second or 3.7 × 1010
becquerel. This is equal to the activity of one
gram of radium
24. 𝑵𝑺
𝑵𝑷=
𝑬𝑺
𝑬𝑷
𝐸𝑃 = 𝐸𝑆
𝑁𝑃
𝑁𝑆=
1000 × 400
2000= 200 𝑉
𝐸𝑆𝐼𝑆 = 𝐸𝑃𝐼𝑃
𝐼𝑃 =1000
200= 50 𝐴
Part-III
25. electric lines of force
1) Start from positive charge and terminate
at negative charge.
ii) Never intersect.
iii) The tangent to a line of force at any point
gives the direction of the electric field
iv) The number of lines per unit area is
proportional to the magnitude of E.
v) Each unit positive charge gives rise to 1
𝜖0
lines of force in free space. N= 𝑞
𝜖0
26.Heat developed across 6 Ω, 𝐻 =𝑉2
𝑅𝑡
50 =𝑉2
61 𝑉2 = 300 𝑉 = 17.32 𝑉
𝑅𝑆 = 𝑅1 + 𝑅2 = 2 + 3 = 5Ω
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A. ABIDHA BEGUM , PG ASSISTANT, GOVT GIRLS HR SEC SCHOOL, PUGALUR KARUR DIST(P.N. 2)
𝐻 =𝑉2
𝑅𝑆𝑡
Heat developed across series combination
300
5= 𝐻 = 60 𝐽
𝐻 = 𝐼12𝑅𝑡 = 𝐼1
2 .5.1=60
𝐼12 = 3.464 𝐴
Heat developed across 2 Ω,
H=𝐼1 2 𝑅𝑡 = 3.462𝑋2 = 24 𝐽
27. Lorentz force
i) Force F on the charge is zero, if the charge
is at rest. . ii) Force is proportional to the
magnitude of the charge (q)
iii) Force is proportional to the magnetic
induction (B)
iv) Force is proportional to the speed of the
charge
v) Direction of the force is oppositely
directed for charges of opposite sign
28. energy associated with an inductor
29. FM
When the frequency of carrier wave is
changed in accordance with the intensity of
the signal, the process is called frequency
modulation. In frequency modulation, the
amplitude and phase of the carrier wave
remains constant. Only, the frequency of the
carrier wave is changed in accordance with
the signal.
Carrier swing =2 ∆ f
30. Braggs law
If the path difference 2dsinθ is equal to
integral multiple of wavelength of X-ray .i.e.
nλ, then the constructive interference will
occur between the reflected beams and they
will reinforce with each other. Therefore the
intensity of the reflected beam is maximum.
crystal lattice spacing 2dsinθ = n λ ; n=
1,2,3,..etc d wavelength of x-rays glancing
angle
31. length contraction
32. 𝑻𝟏 = 𝟏𝟐 𝒉𝒓𝒔 𝑻𝟐 = 𝟏𝟔 𝒉𝒓𝒔
𝑁1
𝑁2=
2
1 𝑛 =
𝑡
𝑇12
𝐹𝑜𝑟 1, 𝑛 =48
12= 4
𝐹𝑜𝑟 2, 𝑛 =48
16= 3
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A. ABIDHA BEGUM , PG ASSISTANT, GOVT GIRLS HR SEC SCHOOL, PUGALUR KARUR DIST(P.N. 3)
𝐹𝑜𝑟 1,𝑁
𝑁0=
1
2𝑛=
1
24=
1
16
𝐹𝑜𝑟 1,𝑁
𝑁0=
1
2𝑛=
1
23=
1
8
(𝑁
𝑁0)1
(𝑁
𝑁0)2
=1
16 ×
8
1=
1
2
33.
Part IV
34.(a)
(or)(b)
35 (a)
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A. ABIDHA BEGUM , PG ASSISTANT, GOVT GIRLS HR SEC SCHOOL, PUGALUR KARUR DIST(P.N. 4)
(or) (b)
36. (a)
(or) (b)
37(a)
(or) (b)
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A. ABIDHA BEGUM , PG ASSISTANT, GOVT GIRLS HR SEC SCHOOL, PUGALUR KARUR DIST(P.N. 5)
38(a)
(or)(b)
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