Dual Nature of Matter and Radiation (KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 11 - 14 of 19

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Question number: 11

» Dual Nature of Matter and Radiation » Photoelectric Effect

MCQ▾

Question

The wavelength of the first line of Balmer series is 6134 Å. The wavelength of the first line of Lyman series is –

Choices

Choice (4) Response

a.

3008 Å

b.

3607 Å

c.

2678 Å

d.

3408 Å

Question number: 12

» 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

Question number: 13

» Dual Nature of Matter and Radiation » Photoelectric Effect

MCQ▾

Question

If the wavelength of photon emitted due to transition of electron from third orbit to first orbit in a hydrogen atom is λ, then the wavelength of photon emitted due to transition of electron from fourth orbit to second orbit will be –

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 14

» Dual Nature of Matter and Radiation » Black-Body Radiation

MCQ▾

Question

A black body radiates heat energy at the rate of Equation at 1150C. The temperature of the black body, at which the rate of heat radiation is Equation , will be –

Choices

Choice (4) Response

a.

2730 C

b.

5270 C

c.

8910 C

d.

9270 C

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