1
JEE Advanced
Single Correct
A proton is fired from very far away towards a nucleus with charge Q = 120 e, where e is the electronic charge. It makes a closest approach of 10 fm to the nucleus. The de Broglie wavelength (in units of fm) of the proton at its start is :
)
(take the proton mass, and
)
A pulse of light of duration 100 ns is absorbed completely by a small object initially at rest. Power of the pulse is 30and the speed of light is . The final momentum of the object is:
The work functions of Silver and Sodium are 4.6 and 2.3 eV, respectively. The ratio of the slope of the stopping potential versus frequency plot for Silver to that of Sodium is
A metal surface is illuminated by light of two different wavelengths and . The maximum speeds of the photoelectrons corresponding to these wavelengths are and , respectively. If the ratio and , the work function of the metal is nearly :