An electron and a proton enter a magnetic field perpendicularly. Both have same kinetic energy. Which of the following is true
|
(a) Trajectory of electron is less curved |
(b) Trajectory of proton is less curved |
|
(c) Both trajectories are equally curved |
(d) Both move on straight-line path |
(b) Trajectory of proton is less curved
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A metallic surface with work function of 2 eV, on heating to a temperature of 800 K gives an emission current of 1 mA. If another metallic surface having the same surface area, same emission constant but work function 4 eV is heated to a temperature of 1600 K, then the emission current will be
|
(a) 1 mA |
(b) 2 mA |
(c) 4 mA |
(d) None of these |
The momentum in mechanics is expressed as m × v. The analogous expression in electricity is
|
(a) I × Q |
(b) I × V |
(c) L × I |
(d) L × Q |
Express which of the following setups can be used to verify Ohm’s law
|
(a)
|
(b)
|
(c)
|
(d)
|
The maximum wavelength of radiation that can produce photoelectric effect in a certain metal is 200 nm. The maximum kinetic energy acquired by electron due to radiation of wavelength 100 nm will be
|
(a) 12.4 eV |
(b) 6.2 eV |
(c) 100 eV |
(d) 200 eV |
Carbon, silicon and Germanium atoms have four valence electrons each. Their valence and conduction band are separated by energy band gaps represented by (Eg)C. (Eg)Si and (Eg)Ge respectively. Which one of the following relationship is true in their case
|
(a) ( |
(b) |
(c) |
(d) |
The momentum of a photon in an X-ray beam of 
metre wavelength is
|
(a) 1.5 |
(b) 6.6 |
|
(c) 6.6 |
(d) 2.5 |
