NEET Questions - Physics - Dual Nature of Matter and Radiation

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Particle A and B have electric charge + q and + 4 q. Both have mass m. If both are allowed to fall under the same p.d., ratio of velocities vA /vB =

2:1
1:2
1:4
4:1

Energy of photon having wavelength $ \lambda$ is 2 eV. This photon when incident on metal. maximum velocity of emitted is v. If $\lambda$ is decreased 25% and maximumu velocity is madedouble, work function of metalis ev

1.2
1.5
1.6
1.8

When elctric bulb having 100 W efficiency emits photon having wavelength 410 mm every second, numbers of photons will be...... $( h =6 \times 10^ {-34} J.s , c = 3 \times 10^8 ms^{-1})$

100
1000
$ 3 \times 10^{20}$
$ 3 \times 10^{18}$

de-Broglie wavelength of proton accelerated under 100V electric potential difference is $\lambda _0$ . Ifde - wave length $\alpha$ - particle accelerated by the same electric potential difference will its bouglie

$ 2 \sqrt { 2 \lambda_0}$
$ \lambda_0 \over {2 \sqrt 2 }$
$ \lambda_0 \over {2 \sqrt 2 }$
$ \lambda_0 \over {2}$

Work function of a body is 4.0 eV. For emission of photoelectron from body, maximum wavelength of light = ..........

540 nm
400 nm
310 nm
220 nm

Photo electric effect on surface is found for frequencies $5.5 \times 10^8 MHz$ and $4.5 \times 10^8 MHz $.If ratio of maximum kinetic energies of emitted photo electrons is 1 : 5, threshold frequency for metal surface is................

$ 7.55 \times 10^8 MHz $
$ 4.57 \times 10^8 MHz $
$ 9.35 \times 10^8 MHz $
$ 5.75 \times 10^8 MHz $

For wave concerned with proton, de-Broglie wavelength change by 0.25% . If its momentum changes by $P_O$ initial momentum = ........

$ 100 P_0$
$ P_0 / 400$
$ 401 P_0$
$ P_0 /100 $

According to Einstein's photoelectric equation, graph of kinetic energy of emitted photo electrons from metal versus frequency of incident radation is linear. Its shope

depends on type of metal used
depends on intensity of radiation
depends on both metal used and intensity of radiation.
is same for allmetals and free from intensity of radiation.

Photocell cell is enlightended by small bright source 1 m away. If the same light source is placed 1/2 m away, number of electrons emitted bycathode will be............

increases twice
decreases twice
increases 4 times
decreases 4 times

If kinetic energy of free electron is made double, change in de-Broglie wavelength will be............

$ \sqrt 2 $
$ 1/ \sqrt2 $
2
1/2

Energy corresponding to threshold frequency of metatlis 6.2 eV. If stopping potential corresponding to radiation incident on surface is 5V, incident radiation will be in the …….region.

x-ray
Ultraviolet
Infrared
Visible

At $ 10 ^ \circ C $ temperature, de-Broglie wave lengthof atomis $ 0.4 A ^\circ $ . If temperature of atom is increased by $ 30 ^\circ C $ , what will be change in de-Broglie wavelength of atom ?

$ decreases10^{-2} A ^\circ $
$ decreases2 \times 10^{-2} A ^\circ $
$ increases 10^{-2} A ^\circ $
$ increases 2 \times 10^{-2} A ^ \circ $

Wavelength of incident radiation on photo sensitive surface is changed from $ 4000 A ^\circ $ to $3000 A ^ \circ $ , so change in stopping potential will be.......

0.345 V
0.435 V
0.543V
0.534 V

Wavelength of incident radiation on photo sensitive surface is $ 4000 A ^ \circ $ If wavelength ofthis light is $ 3600 A ^ \circ $ , what will be change in kinetic energy of emitted photo electron ?$ ( h = 6.625 \times 10^{-34} J.s, c = 3 \times 10^8 ms^{-1}, 1ev = 1.6 \times 10^{-19} J)$

$ 1.1 \times 10^{-34 } m/s$
$ 2.2 \times 10^{-34 } m/s$
$ 3.3 \times 10^{-34 } m/s$
$ 4.4 \times 10^{-34 } m/s$

A hollow metallic cuboidal has mass 10 kg and length 30 cm. At what speed this cuboidal is moved in X-direction so that its de-Broglie wavelength exactly trapped in the cuboidal ?

$ 1.1 \times 10^{-34} m/s $
$ 2.2 \times 10^{-34} m/s $
$ 3.3 \times 10^{-34} m/s $
$ 4.4 \times 10^{-34} m/s $

NEET Physics Questions: Dual Nature of Matter and Radiation