NEET 2020 Phase 1 | Dual Nature of Radiation and Matter Question 10 | Physics

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

NEET 2020 Phase 1

MCQ (Single Correct Answer)

-1

An electron is accelerated from rest through a potential difference of V volt. If the de-Broglie wavelength of the electron is 1.227 $$ \times $$ 10^-2 nm, the potential difference is :

10² V

10³ V

10⁴ V

10 V

NEET 2019

MCQ (Single Correct Answer)

-1

An electron is accelerated through a potential difference of 10,000 V. Its de Broglie wavelength is (nearly) : (m_e = 9 $$ \times $$ 10^–31 kg)

12.2 × 10^–12 m

12.2 × 10^–13 m

12.2 × 10^–14 m

12.2 nm

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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