NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1207 - 1209 of 2320

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Question number: 1207

» Atoms and Nuclei » Hydrogen Spectrum

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MCQ▾

Question

Consider a hydrogen like atom whose energy in n th excited state is given by when this excited atom makes a transition from excited state to ground state, most energetic photons have energy E max = 52.224 eV and least energetic photons have energy E min =1224 eV. The atomic number of atom is,

Choices

Choice (4)Response

a.

4

b.

5

c.

2

d.

None of the above

Question number: 1208

» Properties of Solids & Liquids » Heat Transfer » Convection

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MCQ▾

Question

A composite metal bar of uniform section is made up of length 15 cm of copper, 10 cm of nickel and 5 cm of aluminum. Each part being in perfect thermal contact with the adjoining part. The copper end of the composite rod is maintained at 100°C and the aluminum end at 0°C. The whole rod is covered with belt so that there is no heat loss occurs at the sides. If K Cu = 2K al and K a1 = 3K Ni, then what will be the temperatures of Cu - Ni and Ni - Al junctions respectively,

Choices

Choice (4)Response

a.

50°C and 30°C

b.

30°C and 50°C

c.

83.33°C and 20°C

d.

23.33°C and 78.8°C

Question number: 1209

» Wave Optics » Young's Double Slit Experiment

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MCQ▾

Question

Interference fringes were produced in Young’s double slit experiment using light of wave length 5000 Å. When a film of material 2.5 × 10 -3 cm thick was placed over one of die slits, the fringe pattern shifted by a distance equal to 20 fringe width. The refractive index of the material of die film cannot be

(1) 1.25 (2) 1.33

(3) 1.5 (4) 1.4

Select the correct answers and mark it according to the following codes:

Codes:

Choices

Choice (4)Response

a.

1 and 2 are correct

b.

1 and 3 are correct

c.

1,2 and 3 are correct

d.

2 and 4 are correct

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