Dual Nature of Matter and Radiation (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 30 - 33 of 36

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Passage

A physicist wishes to eject electrons by shining light on a metal surface. The light source emits light of wavelength of 450 nm. The table lists the only available metals and their work functions.

List of metals and their work function

In above table lists of available metals and their work function is given

Metal

W 0 (eV)

Barium

2.5

Lithium

2.3

Tantalum

4.2

Tungsten

4.5

Question number: 30 (2 of 3 Based on Passage) Show Passage

» Dual Nature of Matter and Radiation » Einstein's Photoelectric Equation

MCQ▾

Question

Which option correctly identifies the metal that will produce the most energetic electrons and their energies?

Choices

Choice (4) Response

a.

Lithium, 2.30 eV

b.

Tungsten, 1.75 eV

c.

Lithium, 0.45 eV

d.

Tungsten, 2.75 eV

Question number: 31 (3 of 3 Based on Passage) Show Passage

» Dual Nature of Matter and Radiation » Einstein's Photoelectric Equation

MCQ▾

Question

Which metal (s) can be used to produce electrons by the photoelectric effect from given source of light?

Choices

Choice (4) Response

a.

Lithium, tantalum or tungsten

b.

Barium or lithium

c.

Tungsten or tantalum

d.

Barium only

Question number: 32

» Dual Nature of Matter and Radiation » Particle Nature of Light

Appeared in Year: 2016

MCQ▾

Question

Photons with energy Equation are incident on a cathode C in a photoelectric cell. The maximum energy of emitted photoelectrons is Equation . When photons of energy Equation are incident on C, no photoelectrons will reach the anode A, if the stopping potential of A relative to C is:

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 33

» Dual Nature of Matter and Radiation » De-Broglie Relation

Appeared in Year: 2016

MCQ▾

Question

Electrons of mass Equation with De – Broglie wavelength Equation fall on the target in a X – ray tube. The cutoff wavelength Equation of the emitted X – ray is:

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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