Hot questions

0 votes

0 answers

(i) In Young's double slit experiment, describe briefly how bright and dark fringes are obtained on the screen kept in front of a double slit. Hence, obtain the expression for the fringe width. (ii) The ratio of the intensities at minima to the maxima in the Young's double slit experiment is 9:25.Find the ratio of the widths of the two

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

(i) (a) 'Two independent monochromatic sources of light cannot produce `a` sustained interference pattern'. Give reason.(b) Light waves each of amplitude a and frequency `omega` emanating from two coherent light sources superpose at a point. If the displacements due to these waves is given by `Y_1 = acosomegat and Y_2 = acos(omegat+phi)` where `(phi)` is the phase difference between the two, obtain the expression for the resultant intensity at the point. (ii) In Young's double slit experiment using monochromatic light of wavelength `lambda`, the intensity of light at a point on the screen where path difference is `lambda`, is K

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

(i) What are coherent sources? Why are they necessary for observing a sustained interference pattern? How are the two coherent sources obtained in the Young's double slit experiment? (ii) Show that the superposition of the waves originating from the two coherent sources, `S_1 and S_2` having displacement, `Y_1 = a cosomegat and Y_2 = a cos(omegat+phi)` at a point produce a resultant intensity, `I = 4a^2 cos^2 phi//2` Hence, write the conditions for the appearance of dark and bright

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Four identical monochromatic sources A,B,C,D as shown in the (Fig.) produce waves of the same wavelength λ and are coherent. Two receiver R1 and R2 are at great but equal distaces from B. Which of the two receivers picks up the larger

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW. Find the energy and momentum of each photon in the light

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Answer the following questions: The energy and momentum of an electron are related to the frequency and wavelength of the associated matter wave by the relations: E = h ν, p = λ h But while the value of λ is physically significant, the value of ν (and therefore,

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Derive an expression for debroglie wavelength of an

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Define threshold wavelength for photoelectric effect? Debroglie wavelength associated with an electron associated through a potential difference V isλ ? What will be the new wavelength when the accelerating potential is increase to

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A charged rod P attracts rod R where as P repels another charged rod Q. What type of force is developed between Q and

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A particle of mass m and charge q is released form rest in a uniform electric field of intensity E. calculate the kinetic energy it attains after moving a distance s between the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

(a) What is an equi-potential surface? Show that the electric field is always directed perpendicular to an equi-potential surface. (b) Derive an expression for the potential at a point along the axial line of a short electric

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Force of attraction between two point electric charges placed at a distance d in a medium is F. What distance apart should these be kept in the same medium, so that force between them becomes

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Two identical plane metallic surfaces A and B are kept parallel to each other in air separated by a distance of 1.0 cm as shown in the figure. Surface A is given a positive potential of 10V and the outer surface of B is earthed.(a) What is the magnitude and direction of uniform electric field between point Y and Z? What is the work done in moving a change of 20 µc from point X to Y?(b) Can we have non-zero electric potential in the space, where electric field strength is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

What is the speed of ball when rod becomes vertical? A thin homogeneous rod of mass m and length `l` is free to rotate in vertical plane about a horizontal axle pivoted at one end of the rod. A small ball of mass m and charge q is attached to the opposite end of this rod. The whole system is positioned in a constant horizontal electric field of magnitude mg `E=(mg)/(2q)`. The rod is released from shown position from

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

What amount of heat must be supplied to `2.0 × 10^(–2)` kg of nitrogen (at room temperature) to raise its temperature by 45 °C at constant pressure ? (Molecular mass of `N_2` = 28; R = 8.3 J mo`l^(–1)`

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

0 votes

0 answers

One end of a V-tube containing mercury is connected to a suction pump and the other end to atmosphere. The two arms of the tube are inclined to horizontal at an angle of 45° each. A small pressure difference is created between two columns when the suction pump is removed. Will the column of mercury in V-tube execute simple harmonic motion? Neglect capillary and viscous forces.Find the time period of

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

0 votes

0 answers

A uniformly charged conducting sphere of 2.4 m diameter has a surface charge density of 80.0 µC/m2 . Find the charge on the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Find the current in the sliding rod AB (resistance = R) for the arrangement shown in Fig . B is constant and is out of the paper. Parallel wires have no resistance. v is constant. Switch S is closed at time t = 0.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A device ‘X’ is connected to an a.c source. The variation of voltage, current and power in one complete cycle is shown in Fig . What is the average power consumption over a

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Both alternating current and direct current are measured in amperes. But how is the ampere defined for an alternating

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

Hot questions

Categories