AIPMT 2012 Mains | Dual Nature of Radiation and Matter Question 40 | Physics

Two radiations of photons energies 1 eV and 2.5 eV, successively illuminate a photosensitive metallic surface of work function 0.5 eV. The ratio of the maximum speeds of the emitted electrons is

1 : 4

1 : 2

1 : 1

1 : 5

AIPMT 2012 Mains

MCQ (Single Correct Answer)

-1

If the momentum of an electron is changed by P, then the de Broglie wavelength associated with changes by 0.5%. The initial momentum of electron will be

200 P

400 P

$${P \over {200}}$$

100 P

AIPMT 2012 Prelims

MCQ (Single Correct Answer)

-1

An $$\alpha $$-particle moves in a circular path of radius 0.83 cm in the presence of a magnetic field of 0.25 Wb/m². The de Broglie wavelength associated with the particle will be

1 $$\mathop A\limits^ \circ $$

0.1 $$\mathop A\limits^ \circ $$

10 $$\mathop A\limits^ \circ $$

0.01 $$\mathop A\limits^ \circ $$

AIPMT 2012 Prelims

MCQ (Single Correct Answer)

-1

Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be 3.57 V. The threshold frequency of the material is

4 $$ \times $$ 10¹⁵ Hz

5 $$ \times $$ 10¹⁵ Hz

1.6 $$ \times $$ 10¹⁵ Hz

2.5 $$ \times $$ 10¹⁵ Hz

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