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In a series RLC circuit, the fequency. Passing through a coil as shown in figure-5.253. The time variation of the magnitude of EMF generated across the coil during one cycle is:

Does aphoton have a de-Broglie wavelength ? Explain.

A space station is at a height equal to the radius of the Earth . If v_Eis the escape velocity on the surface of the Earth , the same the spastation v_E

State Brewster's law.

A mass of 0.2 kg is attached to the lower end of a massless spring of force constant 200 N m^(-1) , the upper end of which is fixed to a rigid support. Which of the following statement is not true? (Take g=10 m s^(-2))

If the plates of a parallel plate capacitor are not equal in area then quantity of charge

A gas (gamma=1.5) is taken through adiabatic process in which volume is changed from 16000" cm"^(3) to 400" cm"^(3). If the initial pressure is 150 kPa, how much work is done by the gas in the process ?

Statement I : Half life for certain radioactive element is 5 min . Four nuclei of that elementare observed at a certain instant of time. After five minutes it can be definitely said that two nuclei will be left undecayed . Statement II : Half life is defined as time in which population is halfed .

The angle of contact between mercury and glass is

A thin film of thickness 4xx10^(-5) cm and mu=1.5 is iluminated by white light incident normal to its surface. What wavelength in the visible range be intensified in the reflected beam ?

Mention the power factor of a pure inductor or a capacitor.

Proceeding from Maxwell's equation shown that in the case of a plane electromagnetic wave ( figure ) propagating in vacuum the following relations hold :(deltaE)/(deltat)=-c^(2)(deltaB)/( deltax), (deltaB)/(deltat)-( deltaE)/( deltax).

Prove that in a uniform field the work is independent of the path.

Show that the density of nuclear mass is constant for all isotopes.

….. are used to kill cancerous cells.

A toaster operating at 240 V has a resistance of 120Omega. The power is ………. .

A circuit diagram of a capacitor with two diodes ad an ammeter (Fig) is connected to a source of variable voltage producing rectangular pulses of constant amplitude and frequency. What current does ammeter show? Diodes and ammeter can be considered ideal.

Explain the source of stellar energy. Explain the carbon - nitrogen cycle, proton cycle occurring in stars.

What is the average power dissipation in an ideal capacitor in A.C. circuit ?

Matching {:("List - I","List - II"),("A)" K lt 1 ,"e) Critical state"),("B) K =1 ","f) Sub critical state"),("C)" Kgt1,"g) Super critical"):}

Equal current 'i' flows in the two segments of a circular loop in the direction shown in fig. radius fo the loop is 'a'. Magnetic field at the centre of the loop is

What is electric potential and what are it, s SI units ?

If vec(A)=3hat(i) + 4hat(j) and vec(B)=7hat(i) + 24hat(j). Find the vector having the same magnitude as vec(B) and is parallel to vec(A):

The figure shows a capacitor made of two circular plates each of radius 12 cm, and separated by 5.0 cm . The capacitor is beging charged by an external source (not shown in the figure. ) The charing is constant and equal to 0.15 A Obtain the displacement current across the plates.

Electron of mass m and intial velocity vecV=v_(0)hati (V_(0)gt0) enter electric field vecE=-E_(0)hati(E_(0)) constantat t=0 initial de-Broglie wavelength of electron is lambda_(0) then at time t=t its de-Broglie wavelength will be…..

A square conducting coil of area 100 "cm"^2 is placed normally inside a uniform magnetic field of 10^3 "Wbm"^(-2). The magnetic flux linked with the coil is ___Wb .

A current I flows around a closedpath in the horizontal plane of the circle as shown in the figure. The path consists of eight arcs with alternating radii r and 2r. Each segment of arc subtends equal angle at the common centre P. Find the magnetic field produced by current path at point P

वन्य जीव सुरक्षा कानून कब बनाया गया ?

Huygen's wave theory of light cannot explain

The 1-V characteristic of an LED is shown as

Find the energy Q liberated in beta^(-_(-)) and beta^(+)- decays and in K- caputure if the masses of the parent atom m_(p), the daughter atom M_(d) and an electron m are known.

Name the electromagnetic radiations used for (a) water purification, and (b) eye surgery.

If a sphere is rolling, the ratio of the translational energy to total kinetic energy is given by

How many electron states (including spin states) are possible in a hydrogen atom if its energy is -3.4 eV?

Two wavelengths lamda_(1) and lamda_(2) are used in Young's double slit expt. lamda_(1)=430nm. What is the value of lamda_(2) if 4th bright band of one coincides with 6th bright band of the other?

A convex lens is made of three different materials which are symmetrically distributed as shown in figure. If some point object is placed on its principal axis then what will be the number of images formed ?

The electric field of a plane electromagnetic wave travelling in the positive z direction is described by

If the external resistance is equal to the internal resistance of a cell of emf E. The p.d. across its terminal is

Lenz's law follows the principleof Conservation of

The radio waves of frequency 300 MHz to 3000MHz does not belong to

Light with wavelength lambda falls normally on a long rectangular slit of width b. Find the angular distribution of the intensity of light in the case of Fraunhofer diffraction, as well as the angular position of minima.

Two 1muF capacitors in series is equal to

The first & second stage of two stage rocket separately weigh 100 kg and 10 kg and contain 800kg and 90kg fuel respectively. If the exhaust velocity of gases is 2 km/sec then velocity of rocket after second stage is (nearly) (log_(10)5=0.6990) (neglect gravity)