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Hermoine
Subject: Physics
, asked on 11/5/18
Chp Wave optics topic ; optical path
Meritnation please tell me why that encircled part is zero for the third question
please help
Answer
1
Surbhi Singh
Subject: Physics
, asked on 7/5/18
Q. A barometer tube reads 75 cm of Hg. If tube is gradually inclined at an angle 30
°
with horizontal keeping the open end in the mercury container , then find the length of mercury column in the barometer tube (1) 86. 7 cm (2) 150 cm (3) 75 cm (4) 92.5 cm Q.20 A metallic sphere weighing 3 kg in air is held by a string so as to be completely immersed in a liquid of relative density 0.8 . The relative density of metallic is 10 . The tension in the string is (1) 18 .7 N (2) 42.5 N (3) 32. 7 N (4) 27 .6 N
Answer
2
Mitali
Subject: Physics
, asked on 7/5/18
Please give the solution.... the answer comes 12 and 12 for both dark and bright but i do not get why..??!
Illustration 2.7.
Two sources are placed on x-axis at a separation d =
3
λ
. An observer starts moving from A on a circular track of radius R (R >> d). How many bright points and dark points will he observe?
Find the angular positions of maxima and minima.
Answer
1
Olivia Neibel
Subject: Physics
, asked on 3/5/18
a 4.0kg mass is suspended from an unstretched spring. when released from rest, the mass moves a maximum distance of 0.2m before reversing direction. What are period and frequency of this spring-mass oscillator?
Answer
1
Jeneeta Eliza John
Subject: Physics
, asked on 1/5/18
Explain question no.8. Ans (1)
I
f
A
i
s
t
h
e
a
m
p
l
i
t
u
d
e
o
f
t
h
e
w
a
v
e
c
o
m
i
n
g
f
r
o
m
a
l
i
n
e
s
o
u
r
c
e
a
t
d
i
s
tan
c
e
r
,
t
h
e
n
(
1
)
A
∝
r
-
1
2
(
2
)
A
∝
r
(
3
)
A
∝
r
1
2
(
4
)
A
∝
r
-
2
Answer
1
Archana
Subject: Physics
, asked on 27/4/18
answer this Question : 12 Q . When an unpolarized light of intensity I
0
is Incident on a polarizing sheet, the intensity of light which does not get transmitted is (1) I
0
/2 (2) I
0
/4 (C) ZERO (D) I
0
Answer
1
Hermoine
Subject: Physics
, asked on 26/4/18
Please help asap
Q5. Light of wavelength 520 nm passing through a double slit, produces interference pattern of relative intensity versus deflection angle
θ
as shown in the figure. Find the separation
d
between the slits.
Ans :- 1.98 × 10
–2
mm
Answer
1
Aparna Sahu
Subject: Physics
, asked on 23/4/18
Solve this:
Q31. In Young's double slit experiment, an interference pattern is obtained on a screen by a light of wavelength 6000 Å coming from the coherent sources S
1
and S
2
. At certain point P on the screen third fringe is formed. Then the path difference S
1
P –S
2
P is microns is
(a) 0.75
(b) 1.5
(c) 3.0
(d) 4.0
Answer
1
Mayank Deshpande
Subject: Physics
, asked on 23/4/18
thank you.
Q.3. For a certain transverse standing wave on a long string, an antinode is formed at x = 0 and next to it, a node is formed at x = 0.10 m. The displacement y(t) of the string particle at x = 0 is shown in figure.
(A) Transverse displacement of the particle at x = 0.05 m and t = 0.05 s is - 2
2
cm.
(B) Transverse displacement of the particle at x = 0.04 m and t = 0.025 s is - 2
2
cm.
(C) Speed of the travelling waves that interfere to produce this standing wave is 2 m/s.
(D) The transverse velocity of the string particle at x =
1
15
m and t = 0.1 s is 20
π
cm/s
Answer
1
Mitali
Subject: Physics
, asked on 19/4/18
When it is mentioned in the question that the spring is massless and inextensible does it mean that we don't have to account for the value of spring constant k..??!
Answer
1
Mitali
Subject: Physics
, asked on 19/4/18
What is the basic idea for solving this...??! How do we check these options?!
6. In Young's double-slit experiment. the separation
between the two slits is d and the wavelength of the light
is
λ
.The intensity of light falling on slit 1 is four times
the intensity of light falling on slit 2. Choose the correct
choice(s). (IIT-JEE, 2008)
a. If d=
λ
, the screen will contain only one maximum
b. If
λ
<
d
<
2
λ
, atleast one more maximum (besides the
central maximum) will be observed on the screen
c. If the intensity of light falling on slit 1 is reduced so
that it becomes equal to that of slit 2. the intensities of
the observed dark and bright fringes will increase
d. If the intensity of light falling on slit 2 is increased so
that it becomes equal to that of slit I , the intensities of
the observed dark and bright fringes will increase
Answer
1
Muhammad Arafath R Z
Subject: Physics
, asked on 18/4/18
Simple harmonic motion mains 2018
Simple harmonic motion mains 2018:
Q. 28. Two simple harmonic motions, as show below, are at right angles. They are combined to form Lissajous figures.
x(t)= A sing (at+8)
y(t)= B sing (bt)'
Identify the correct match below.
Option :
1
.
A
≠
B
,
a
=
b
;
8
=
π
/
2
Ellipse
2
.
A
=
B
,
a
=
2
b
;
8
=
π
/
2
CIrcle
3
.
A
≠
B
,
a
=
b
;
8
=
0
Parabola
4
.
A
=
B
,
a
=
b
;
8
=
π
/
2
Line
Answer
1
Aparna Sahu
Subject: Physics
, asked on 18/4/18
Solve 49
Q.49. In a Young's double slit experiment, the separation between the slits is 4
×
10
-
3
m and the distance of the screen from the plane of the slit is 2 m. Light of wavelength in the range 2000
A
°
to 8000
°
A is allowed to fall on the slits. The wavelength that will be present on the screen at 5
×
10
-
3
m from the central maximum is
(a) 3500
A
0
(b) 2500
A
0
(c) 4500
A
0
(d) 6500
A
0
Answer
1
Anuj
Subject: Physics
, asked on 17/4/18
Assuming 1st order diffraction with interparticle distance in a crystal og 0.4nm, calculate the wavelength of X-rays which produce a diffraction angle 20 equal to 0.286 radian for a crystal.
Answer
1
Mohan
Subject: Physics
, asked on 12/4/18
An air bubble in a glass sphere is viewed by an observer of radius 10 cm from outside and appears at depth of 4 cm. what is it's actual depth? where will it appear if seen from opposite?
Answer
2
1
2
3
4
5
Next
What are you looking for?
Meritnation please tell me why that encircled part is zero for the third question
please help
Find the angular positions of maxima and minima.
Q5. Light of wavelength 520 nm passing through a double slit, produces interference pattern of relative intensity versus deflection angle as shown in the figure. Find the separation d between the slits.
Ans :- 1.98 × 10–2 mm
Q31. In Young's double slit experiment, an interference pattern is obtained on a screen by a light of wavelength 6000 Å coming from the coherent sources S1 and S2. At certain point P on the screen third fringe is formed. Then the path difference S1P –S2P is microns is
(a) 0.75
(b) 1.5
(c) 3.0
(d) 4.0
Q.3. For a certain transverse standing wave on a long string, an antinode is formed at x = 0 and next to it, a node is formed at x = 0.10 m. The displacement y(t) of the string particle at x = 0 is shown in figure.
(A) Transverse displacement of the particle at x = 0.05 m and t = 0.05 s is - 2 cm.
(B) Transverse displacement of the particle at x = 0.04 m and t = 0.025 s is - 2 cm.
(C) Speed of the travelling waves that interfere to produce this standing wave is 2 m/s.
(D) The transverse velocity of the string particle at x = m and t = 0.1 s is 20 cm/s
6. In Young's double-slit experiment. the separation
between the two slits is d and the wavelength of the light
is .The intensity of light falling on slit 1 is four times
the intensity of light falling on slit 2. Choose the correct
choice(s). (IIT-JEE, 2008)
a. If d= , the screen will contain only one maximum
b. If , atleast one more maximum (besides the
central maximum) will be observed on the screen
c. If the intensity of light falling on slit 1 is reduced so
that it becomes equal to that of slit 2. the intensities of
the observed dark and bright fringes will increase
d. If the intensity of light falling on slit 2 is increased so
that it becomes equal to that of slit I , the intensities of
the observed dark and bright fringes will increase
Q. 28. Two simple harmonic motions, as show below, are at right angles. They are combined to form Lissajous figures.
x(t)= A sing (at+8)
y(t)= B sing (bt)'
Identify the correct match below.
Option :
Q.49. In a Young's double slit experiment, the separation between the slits is 4 m and the distance of the screen from the plane of the slit is 2 m. Light of wavelength in the range 2000 to 8000A is allowed to fall on the slits. The wavelength that will be present on the screen at 5 m from the central maximum is
(a) 3500
(b) 2500
(c) 4500
(d) 6500