NEET 2013 | Dual Nature of Radiation and Matter Question 41 | Physics

NEET 2013

MCQ (Single Correct Answer)

-1

For photoelectric emission from certain metal the cutoff frequency is $$\upsilon $$. If radiation of frequency 2$$\upsilon $$ impinges on the metal plate, the maximum possible velocity of the emitted electron will be (m is the electron mass)

$$\sqrt {{{2h\upsilon } \over m}} $$

$$2\sqrt {{{h\upsilon } \over m}} $$

$$\sqrt {{{h\upsilon } \over {\left( {2m} \right)}}} $$

$$\sqrt {{{h\upsilon } \over m}} $$

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 Mains

MCQ (Single Correct Answer)

-1

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 Prelims

MCQ (Single Correct Answer)

-1

A 200 W sodium street lamp emits yellow light of wavelength 0.6 $$\mu $$m. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is

1.5 $$ \times $$ 10²⁰

6 $$ \times $$ 10¹⁸

62 $$ \times $$ 10²⁰

3 $$ \times $$ 10¹⁹

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