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

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

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 = $3\lambda$. 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.

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?

Subject: Physics, asked on 1/5/18

## Explain question no.8. Ans (1)

Subject: Physics, asked on 27/4/18

## answer this Question : 12 Q . When an unpolarized light of intensity I0 is Incident on a polarizing sheet, the intensity of light which does not get transmitted is (1) I0/2   (2) I0/4  (C)  ZERO  (D) I0

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 $\mathrm{\theta }$ as shown in the figure. Find the separation d between the slits.                           Ans :- 1.98 × 10–2 mm

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 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

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$\sqrt{2}$ cm. (B) Transverse displacement of the particle at x = 0.04 m and t = 0.025 s is - 2$\sqrt{2}$ 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 = $\frac{1}{15}$ m and t = 0.1 s is 20$\mathrm{\pi }$ cm/s

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..??!

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  $\lambda$.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= $\lambda$, the screen will contain only one maximum b. If $\lambda , 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

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 :

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 $\stackrel{0}{A}$ (b) 2500 $\stackrel{0}{A}$ (c) 4500 $\stackrel{0}{A}$ (d) 6500 $\stackrel{0}{A}$

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.

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?

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