Dielectric constant for metal is
|
(a) Zero |
(b) Infinite |
(c) 1 |
(d) Greater than 1 |
Dielectric constant for metal is
|
(a) Zero |
(b) Infinite |
(c) 1 |
(d) Greater than 1 |
(b) Infinite
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γ-rays radiation can be used to create electron-positron pair. In this process of pair production, γ-rays energy cannot be less than
|
(a) 5.0 MeV |
(b) 4.02 MeV |
(c) 15.0 MeV |
(d) 1.02 MeV |
Consider the following statements A to B and identify the correct answer
A. Polarised light can be used to study the helical surface of nucleic acids.
B. Optics axis is a direction and not any particular line in the crystal
|
(a) A and B are correct |
(b) A and B are wrong |
|
(c) A is correct but B is wrong |
(d) A is wrong but B is correct |
A silver ball of radius 4.8 cm is suspended by a thread in the vacuum chamber. UV light of wavelength 200 nm is incident on the ball for some times during which a total energy of 1 × 10–7 J falls on the surface. Assuming on an average one out of 103 photons incident is able to eject electron. The potential on sphere will be
|
(a) 1 V |
(b) 2 V |
(c) 3 V |
(d) Zero |
The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light: