HSC Science (General) इयत्ता १२ वी - Maharashtra State Board Important Questions

According to De-Broglie, the waves are associated with ______ 

Planck's constant is 6.6 × 10^-34 Js. The momentum of each photon is given radiation Is 3.3 × 10^-29 kg/s. The λ of radiation is ______.

Define photoelectric effect. 

The minimum frequency for photoelectric effect on metal is 7 × 10¹⁴ Hz, Find the work function of the metal. 

If the total energy of radiation of frequency 10¹⁴ Hz is 6.63 J, Calculate the number of photons in the radiation. 

An electron is accelerated through a potential of 120 V. Find its de Broglie wavelength.

State Einstein photoelectric equation. 

What is the photoelectric effect? Define stopping potential and photoelectric work function. 

Calculate De Broglie's wavelength of the bullet moving with speed 90m/sec and having a mass of 5 gm. 

Explain De Broglie’s Hypothesis.

With the help of a circuit diagram describe the experiment to study the characteristics of the photoelectric effect. Hence discuss any 2 characteristics of the photoelectric effect.  

Is it always necessary to use red light to get a photoelectric effect?

Explain de-Broglie wavelength.

Obtain an expression for de-Broglie wavelength of wave associated with material particles. The photoelectric work function for metal is 4.2 eV. Find the threshold wavelength.

If the maximum kinetic energy of emitted electrons in the photoelectric effect is 2eV, the stopping potential will be ______.

An electron is accelerated through a potential difference of 100 volts. Calculate de-Broglie wavelength in nm.

To convert a moving coil galvanometer into an ammeter we need to connect a ______.

In a photoelectric experiment, the stopping potential is 1.5V. What is the maximum kinetic energy of a photoelectron?

Distinguish between ‘paramagnetic’ and ‘ferromagnetic’ substances.

The decay constant of radioactive substance is 4.33 x 10^-4 per year. Calculate its half life period.