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Dual Nature of Matter — BITSAT Physics PYQs

29 previous year questions from Dual Nature of Matter with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

Dual Nature of Matter — BITSAT Physics PYQs

Which figure shows the correct variation of applied potential difference (V) with photoelectric current (I) at two different intensities of light ( I ₁ I ₂ ) of same wavelengths:

The acceptor level of a p-type semiconductor is 6 eV . The maximum wavelength of light which can create a hole would be : Given hc =1242 eV nm .

When light is incident on a metal surface the maximum kinetic energy of emitted electrons

If the kinetic energy of a free electron doubles, it's de-Broglie wavelength changes by the factor

A proton and an -particle are accelerated from rest by 2 ~V and 4 ~V potentials, respectively. The ratio of their de-Broglie wavelength is:

Proton (p) and electron (e) will have same deBroglie wavelength when the ratio of their momentum is (assume, m_p=1849 ~m _ e )

The energy levels of an atom is shown is figure. Which one of these transitions will result in the emission of a photon of wavelength 124.1 ~nm ? Given ( h =6.62 10⁻³⁴ Js )

The de-Broglie wavelength of an electron moving with a velocity c 3 (c=3 10^8 ~m / s ) is equal to the wavelength of photon. The ratio of the kinetic energies of electron and photo

Monochromatic light of wavelength 667 ~nm is produced by a helium neon laser. The power emitted is 9 ~mW . The number of photons arriving per sec on the average at a target irradia

Electrons are accelerated through a potential difference V and protons are accelerated through a potential difference 4 ~V . The de - Broglie wavelengths are _ e and _ p for electr

A plane electromagnetic wave is incident on a plane surface of area A, normally and is perfectly reflected. If energy E strikes the surface in time t then force exerted on the surf

A plane electromagnetic wave is incident on a plane surface of area A, normally and is perfectly reflected. If energy E strikes the surface in timet then average pressure exerted o

A particle X of mass m and initial velocity u collides with another particle Y of mass 3 m 4 , which is at rest. The collision is head-on and perfectly elastic. The ratio of de-Bro

The frequency and the intensity of incident beam of light falling on the surface of a photoelectric material is increased by a factor of two. This will

When photon of energy 4 . 0 eV strikes the surface of a metal A , the elected photoelectrons have maximum kinetic energy T A eV and de-Broglie wavelength &#955; A . The maximum kin

The de-Broglie wavelength of a proton (charge = 1 . 6 &#215; 10 - 19 C , m = 1 . 6 &#215; 10 - 27 kg ) accelerated through a potential difference of 1 kV is

Find the number of photon emitted per second by a 25 watt source of monochromatic light of wavelength 6600 Å . What is the photoelectric current assuming 3 % efficiency for photoel

The beam of light has three wavelengths 4144 Ã, 4972 Ã and 6216 Ã with a total intensity of 3.6 10⁻³ Wm ² equally distributed amongst the three wavelengths. The beam falls normally

When 0.50 Ã X-rays strike a material, the photoelectrons from the k shell are observed to move in a circle of radius 23 ~mm in a magnetic field of 2 10⁻² tesla acting perpendicular

The threshold wavelength of the tungsten is 2300 Ã… . If ultraviolet light of wavelength 1800 Ã… is incident on it, then the maximum kinetic energy of photoelectrons would be about

Graph betwen stopping potential for most energetic emitted photoelectrons ( V _ s ) with frequency (v) of incident radiation on metal is given below. Value of AB / BC , in graph is

A light having wavelength 300 nm fall on a metal surface. The work function of metal is 2.54 eV , what is stopping potential?

In an experiment on photoelectric effect photons of wavelength 300 nm eject electrons from a metal of work function 2.25 eV . A photon of energy equal to that of the most energetic

If the energy of a photon is 10 eV , then its momentum is

An electron, in a hydrogen-like atom, is in an excited state. It has a total energy of -3.4 eV . The kinetic energy and the de-Broglie wavelength of the electron are respectively

Light of wavelength 180 nm ejects photoelectron from a plate of a metal whose work function is 2 eV . If a uniform magnetic field of 5 10⁻⁵ ~T is applied parallel to plate, what wo

The photoelectric threshold of metal is 2000 . The energy of the electrons ejected from the surface by ultraviolet light of wavelength 1500 is

A material particle with a rest mass m ₀ is moving with a velocity of light c . Then the wavelength of the de Broglie wave associated with it is :

In a photoelectric experiment, with light of wavelength , the fastest electron has speed v . If the exciting wavelength is changed to 3 / 4 , the speed of the fastest emitted elect

When photon of energy 4 . 0 eV strikes the surface of a metal A , the elected photoelectrons have maximum kinetic energy T A eV and de-Broglie wavelength λ A . The maximum kin

The de-Broglie wavelength of a proton (charge = 1 . 6 × 10 - 19 C , m = 1 . 6 × 10 - 27 kg ) accelerated through a potential difference of 1 kV is