AIPMT 2008 | Dual Nature of Radiation and Matter Question 60 | Physics

The work function of a surface of a photosensitive material is 6.2 eV. The wavelength of the incident radiation for which the stopping potential is 5 V lies in the

infrared region

X-ray region

Ultraviolet region

Visible region

AIPMT 2008

MCQ (Single Correct Answer)

-1

A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of 3 $$ \times $$ 10⁶ m s^$$-$$1. The velocity of the particle is

3 $$ \times $$ 10^$$-$$31 ms^$$-$$1

$$2.7 \times {10^{ - 21}}\,m{s^{ - 1}}$$

2.7 $$ \times $$ 10^$$-$$18 ms^$$-$$1

9 $$ \times $$ 10^$$-$$2 ms^$$-$$1

AIPMT 2007

MCQ (Single Correct Answer)

-1

Monochromatic light of frequency 6.0 $$ \times $$ 10¹⁴ Hz is produced by a laser. The power emitted is 2 $$ \times $$ 10^$$-$$3 W. The number of photons emitted, on the average, by the source per second is

5 $$ \times {10^{16}}$$

5 $$ \times {10^{17}}$$

5 $$ \times {10^{14}}$$

5 $$ \times {10^{15}}$$

AIPMT 2007

MCQ (Single Correct Answer)

-1

A beam of electron passes undeflected through mutually perpendicular electric and magnetic fields. If the electric field is switched off, and the same magnetic field is maintained, the electrons move

in a circular orbit

along a parabolic path

along a straight line

in an elliptical orbit.

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