NEET 2021 | Dual Nature of Radiation and Matter Question 8 | Physics

NEET 2021

MCQ (Single Correct Answer)

-1

The number of photons per second on an average emitted by the source of monochromatic light of wavelength 600nm, when it delivers the power of 3.3 $$\times$$ 10^$$-$$3 watt will be : (h = 6.6 $$\times$$ 10^$$-$$34 Js)

10¹⁵

10¹⁸

10¹⁷

10¹⁶

NEET 2021

MCQ (Single Correct Answer)

-1

An electromagnetic wave of wavelength '$$\lambda$$' is incident on a photosensitive surface of negligible work function. If 'm' mass is of photoelectron emitted from the surface has de-Broglie wavelength $$\lambda$$_d, then :

$$\lambda = \left( {{{2h} \over {mc}}} \right){\lambda _d}^2$$

$$\lambda = \left( {{{2m} \over {hc}}} \right){\lambda _d}^2$$

$${\lambda _d} = \left( {{{2mc} \over h}} \right){\lambda ^2}$$

$$\lambda = \left( {{{2mc} \over h}} \right){\lambda _d}^2$$

NEET 2020 Phase 1

MCQ (Single Correct Answer)

-1

Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled?

four times

one-fourth

zero

doubled

NEET 2020 Phase 1

MCQ (Single Correct Answer)

-1

Light with an average flux of 20 W/cm² falls on a non-reflecting surface at normal incidence having surface area 20 cm². The energy received by the surface during time span of 1 minute is :

12 $$ \times $$ 10³ J

24 $$ \times $$ 10³ J

48 $$ \times $$ 10³ J

10 $$ \times $$ 10³ J

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Human Health and Diseases Body Fluids and Its Circulation Locomotion and Movement Neural Control and Coordination Reproduction in Organisms Reproductive Health Structural Organisation in Animals Digestion and Absorption Excretory Products and Their Elimination Chemical Coordination and Integration Human Reproduction Animal Kingdom Breathing and Exchange of Gases Evolution