NEET 2013 | Dual Nature of Radiation and Matter Question 42 | Physics

NEET 2013

MCQ (Single Correct Answer)

-1

A parallel beam of fast moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statements is correct ?

The angular width of the central maximum will decrease.

The angular wifth of the central maximum will be unaffected.

Diffraction pattern is not observed on the screen in the case of electrons.

The angular width of the central maximum of the diffraction pattern will increase.

NEET 2013

MCQ (Single Correct Answer)

-1

The wavelength $$\lambda $$_e of an electron and $$\lambda $$_p of a photon of same energy E are related by

$${\lambda _p} \propto \sqrt {{\lambda _e}} $$

$${\lambda _p} \propto {1 \over {\sqrt {{\lambda _e}} }}$$

$${\lambda _p} \propto {\lambda _e}^2$$

$${\lambda _p} \propto {\lambda _e}$$

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

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

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