AIPMT 2012 Prelims | Dual Nature of Radiation and Matter Question 41 | Physics

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

AIPMT 2011 Mains

MCQ (Single Correct Answer)

-1

The threshold frequency for a photosensitive metal is 3.3 $$ \times $$ 10¹⁴ Hz. If light of frequency 8.2 $$ \times $$ 10¹⁴ Hz is incident on this metal, the cut- off voltage for the photoelectron emission is nearly

1 V

2 V

3 V

5 V

AIPMT 2011 Prelims

MCQ (Single Correct Answer)

-1

In photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is

1.8 V

1.3 V

0.5 V

2.3 V

AIPMT 2011 Prelims

MCQ (Single Correct Answer)

-1

Electrons used in an electron microscope are accelerated by a voltage of 25 kV. If the voltage is increased to 100 kV then the de-Broglie wavelength associated with the electrons would

increase by 2 times

decrease by 2 times

decrease by 4 times

increase by 4 times

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