Which particles will have minimum frequency of revolution when projected with the same velocity perpendicular to a magnetic field
|
(a) |
(b) Electron |
(c) Proton |
(d) |
(a) 
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A photon collides with a stationary hydrogen atom in ground state inelastically. Energy of the colliding photon is 10.2 eV. After a time interval of the order of micro second another photon collides with same hydrogen atom inelastically with an energy of 15 eV. What will be observed by the detector
|
(a) 2 photon of energy 10.2 eV |
|
(b) 2 photon of energy of 1.4 eV |
|
(c) One photon of energy 10.2 eV and an electron of energy 1.4 eV |
|
(d) One photon of energy 10.2 eV and another photon of 1.4 eV |
Our eye is most sensitive for which of the following wavelength
|
(a) 4500 Å |
|
(b) 5500 Å |
|
(c) 6500 Å |
|
(d) Equally sensitive for all wave lengths of visible spectrum |
A point object O is placed on the principal axis of a convex lens of focal length 20 cm at a distance of 40 cm to the left of it. The diameter of the lens is 10 cm. If the eye is placed 60 cm to the right of the lens at a distance h below the principal axis, then the maximum value of h to see the image will be
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(a) 0 |
(b) 5 cm |
(c) 2.5 cm |
(d) 10 cm |
In a PNP transistor the base is the N-region. Its width relative to the P-region is
|
(a) Smaller |
(b) Larger |
(c) Same |
(d) Not related |
