Dual Nature of Matter and Radiation-Einstein's Photoelectric Equation (KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 1 - 3 of 3

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Question number: 1

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

Appeared in Year: 2011

MCQ▾

Question

Due to transitions among its first three energy levels, hydro genic atom emits radiation at three discrete wavelengths λ1, λ2, and λ3. Then

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 2

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

MCQ▾

Question

A stream of photons having energy 5 eV each impinges on a Lithium surface. The work function of Lithium is 2.9 eV. The emerging photo-electrons are slowed down by copper plate placed 3 mm away. If the potential difference between two metal plates is 1 V, the maximum distance the electrons can move away from the Lithium surface before being turned back is –

Choices

Choice (4) Response

a.

6.3 mm

b.

7.8 mm

c.

5.5 mm

d.

7.0 mm

Question number: 3

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

MCQ▾

Question

A stream of photons having energy 4.5 eV each impinges on a magnesium surface. The work function of magnesium is 3.66 eV. The emerging photo – electrons are slowed down by copper plates placed 10 mm away. If the potential difference between the two metal plates is 1 V, the maximum distance the electrons can move away from the magnesium surface before being turned back is –

Choices

Choice (4) Response

a.

8.3 mm

b.

5.0 mm

c.

7.0 mm

d.

3.5 mm

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