Dual Nature of Matter and Radiation-Einstein's Photoelectric Equation (KVPY Stream SB-SX (Class 12 & 1st Year BSC) 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 (λ1<λ2<λ3) . Then

Choices

Choice (4) Response

a.

1λ1=1λ2+1λ3

b.

1λ1+1λ2=1λ3

c.

λ1+λ2=λ3

d.

λ1=λ2+λ3

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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