KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 235 - 238 of 268

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Question number: 235

» Dual Nature of Matter and Radiation » Photoelectric Effect

Appeared in Year: 2014

MCQ▾

Question

A 160 watt light source is radiating light of wavelength 6200 Å uniformly in all directions. The photon flux at a distance of 1.8 m is of the order of (Planck’s constant 6.63 × 10–34 J-s)

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Question number: 236

» Atoms and Nuclei » Radioactivity

Appeared in Year: 2015

MCQ▾

Question

Carbon -11 decays to boron -11 according to the following formula.

Assume that positrons (e+) produced in the decay combine with free electron in the atmosphere and annihilate each other almost immediately. Also assume that the neutrinos (νe) are massless and do not interact with the environment. At t = 0 we have 1 µg of. If the half-life of the decay process is t0, the net energy produced between time t = 0 and t = 2t0 will be nearly,

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Question number: 237

» Atoms and Nuclei » Energy Levels

Appeared in Year: 2014

MCQ▾

Question

The wavelength of the first Balmer line caused by a transition from the n = 3 level to the n = 2 level in hydrogen is λ1. The wavelength of the line caused by an electronic transition from n = 5 to n = 3 is –

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Question number: 238

» Gravitation » Universal Law of Gravitation

MCQ▾

Question

A hanging wire is 170 cm long having a bob of 1.50 kg. It shows a time period of 1.35 s on a Planet Newtonia. If the circumference of Newtonia is, find the mass of the planet.

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