Hot questions

0 votes

0 answers

An electron is moving with an initial velocity ` v = v_0hat i` and is in a magnetic field 0 `B=B_ 0hatj`. Then it’s de Broglie

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

0 votes

0 answers

The de Broglie wavelength of a photon is twice the de Broglie wavelength of an electron. The speed of the electron is `V_e=c/100`.

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

0 votes

0 answers

A proton and an α-particle are accelerated, using the same potential difference. How are the deBroglie wavelengths λp and λa related to each

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

0 votes

0 answers

In the explanation of photo electric effect, we asssume one photon of frequency ν collides with an electron and transfers its energy. This leads to the equation for the maximum energy `E_max` of the emitted electron as `E_max = hν – φ_0` where` φ_0` is the work function of

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

0 votes

0 answers

A student performs an experiment on photoelectric effect, using two materials A and B. A plot of Vstop vs ν is given in Fig. Given the electric charge of an electron = 1.6 × 10–19 C, find the value of h obtained from the experiment for both A

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

0 votes

0 answers

Consider a 20 W bulb emitting light of wavelength 5000 A ° and shining on a metal surface kept at a distance 2m. Assume that the metal surface has work function of 2 eV and that each atom on the metal surface can be treated as a circular disk of radius 1.5 A ° .

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

0 votes

0 answers

Work function of Na is 2.3eV. Does sodium show photoelectric emission for light on the velocity of

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

0 votes

0 answers

An electric field is given by `vecE=(yhati+xhatj)N/C`. Find the work done (in J) in moving a 1C charge from `vecr_A=(2hati+2hatj)m` to

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

0 votes

0 answers

Six charges are kept at the vertices of a regular hexagon as shown in the figure. If magnitude of force applied by +Q on +q charge is F, then net electric force on the +Q is nF. Find the value of n.

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

0 votes

0 answers

A point charge q is situated at a distance r from one end of a thin conducting rod of length L having a charge Q (uniformly distributed along its length). The magnitude of electric force between the two, is

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

0 votes

0 answers

Four equal charges Q are placed at the four corners of a square of each side is ‘a’. Workdone in removing a charge - Q from its centre to infinity is

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

0 votes

0 answers

A small conducting sphere of radius r is lying concentrically inside a bigger hollow conducting sphere of radius R. The bigger and smaller sphere are charged with Q and q (Q > q) and are insulated from each other. The potential difference between the sphers will be

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

0 votes

0 answers

When a planet X is at a distance of 824.7 million kilometers from earth its angular diameter is measured to be `35.72^(11)` of arc. Calculate the diameter of

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

0 votes

0 answers

Three equal masses of 2 kg each are placed at the vertices of an equilateral triangle and a mass of 4 kg is placed at the centroid of the triangle which is at a distance of `sqrt2 m` from each of the vertices of the triangle. The force (in newton) acting on the mass of 4 kg

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

0 votes

0 answers

A train, standing in a station-yard, blows a whistle of frequency 400 Hz in still air. The wind starts blowing in the direction from the yard to the station with a speed of 10 m `s^(–1)`. What are the frequency, wavelength, and speed of sound for an observer standing on the station’s platform? Is the situation exactly identical to the case when the air is still and the observer runs towards the yard at a speed of 10 m `s^(–1)`? The speed of sound in still air can be taken as 340 m

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

0 votes

0 answers

In general in an alternating current

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

0 votes

0 answers

For high frequency, a capacitor

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

0 votes

0 answers

An inductor of inductance L and resistor of resistance R are joined in series and connected by a source of frequency ω power dissipated in the circuit

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

0 votes

0 answers

What will be its reactance if frequency of AC is

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

0 votes

0 answers

A capacitor of 50 pF is connected to an a.c. source of frequency 1kHz Calculate its

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

Hot questions

Categories