YDSE Problems II

Q. Two soap bubbles of radii 2cm and 4cm join to form a double bubble in air, then radius of curvature of interface i

Q. two soap bubbles each of radius r , coalesces to form a single bubble isothermally then the radius of bigger drop will be

Q.

A wave is reflected from a rigid support. The change in phase on reflection will be

[MP PMT 1990; RPMT 2002]

1. 

2. 

3. 

4. 

Q. 124.Two soap bubbles in vacuum having radii 3cm and 4cm respectively coalesce under isothermal conditions to form a single bubble.What is the radius of new bubble?

Q. 25.Two soap bubbles of radii 2 cm and 4cm join to form a double bubble in air, then the radius of curvature of interface is 2cm 4cm 2\sqrt{}3cm 2\sqrt{}5cm

Q. 76.Two soap Bubbles having ready 6 centimetre and 8 centimetre in vacuum coalesce under isothermal conditions. The radius of the new bubble is

Q. 143.Two soap bubbles coalesce. It is noticed that while joining together radius of two bubbles are a and b (a>b) . Then the radius of curvature of interface between the two bubbles will be ?? In terms of a and b ??

Q. In young's double slit experiment, the slit separation is 1.0 mm and the screen is placed at a distance of 1.0m from the plane of the slits. If the slit separation is changed by 0.05 mm, the fringe width changes by 0.03mm. The wavelength of light used is

1. 4000A
2. 5000A
3. 6000A
4. 7000A

Q. In an interference experiment monochromatic light is replaced by white light, we will see (1) Uniform illumination on the screen (2) Uniform darkness on the screen (3) Equally spaced white and dark bands (4) A few coloured bands and then uniform illumina?

Q.

Two sound waves (expressed in CGS units) given by $y_1=0.3sin\frac{2\pi }{\lambda }(vt-x)$ and $y_2=0.4sin(vt-x+\theta )$ and interfere. The resultant amplitude at a place where phase difference is $\frac{\pi }{2}$ will be

[MP PET 1991]

1. 0.1 cm

2. 

3. 0.5 cm

4. 0.7 cm

Q. 124.Two soap bubbles in vaccum having tadii 3cm and 4cm respectively coalesce under isothermal condition to form a single bubble. What is the radius of the new bubble?

Q. A soap bubble is blown to a diameter of 7 cm. If 36960 erg of work is done in blowing it further, find the new radius. The surface tension of soap solution is 40 dyne/cm.

Q. A Young's double slit experiment is being performed by illuminating the two slits with a monochromatic source of light.
When a glass plate of thickness $24\mu \text{m}$ is placed in front of one of the slits, the entire pattern shifts through a distance of $5\text{mm}$. What should be the thickness of the glass plate made of the same material so that the pattern shifts by $15\text{mm}$?

1. $8\mu \text{m}$
2. $48\mu \text{m}$
3. $72\mu \text{m}$
4. $12\mu \text{m}$

Q. White coherent light $(4000-7000\stackrel{\circ }{A})$ is sent through the slits of a YDSE. The separation between the slits is $0.5\text{mm}$ and screen is $50\text{cm}$ away from the slits. There is a hole in the screen at a point 1.0 mm away (along the width of the fringe) from the central line.
a. Which wavelength(s) will be absent in the light coming from the hole?
b. Which wavelength(s) will have a strong intensity?

1. $5000\stackrel{\circ }{A}$, $7000\stackrel{\circ }{A}$
2. $4000\stackrel{\circ }{A}$, $6000\stackrel{\circ }{A}$.
3. $7000\stackrel{\circ }{A}$, $5000\stackrel{\circ }{A}$.
4. $3000\stackrel{\circ }{A}$, $6000\stackrel{\circ }{A}$.

Q. The distance between two slits is 1.2 mm. If the wavelength of light used is $4800\dot{A}$ and the screen is at a distance of 1 m from the slits, how many fringes are observed on the screen in the space opposite to the slits

1. 1
2. 2
3. 3
4. 8