get lan V2. (F) if -1

A body of mass m has an initial speed v is acted by two forces vec(F)_(1) and vec(F)_(2) . After something work done by vec(F)_(1) is -1/2 mv^(2) and speed of the body is 2v. Then, the work done by vec(F)_(2) is

Let A={u,v,w,x} .A bijective function f:A rarr A is chosen at random, then the probability that f(u)!=u,f(v)!=v,f(w)!=w and f(x)!=x is 1) (3)/(8) 2) (11)/(24) 3) (1)/(64) 4) (7)/(24)

Two identical photo-cathodes receive light of frequencies f_1 and f_2 . If the velocities of the photoelectrons (of mass m) coming out are v_1 and v_2 respectively, then

Two identical photocathodes receive light of frequencies f_1 and f_2 . If the velocities of the photo electrons (of mass m ) coming out are respectively v_1 and v_2 then

Threshold frequency of metal is f_(0) . When light of frequency v = 2f_(0) is incident on the metal plate, velocity of electron emitted in V_(1) . When a plate frequency of incident radiation is 5f_(0), V_(2) is velocity of emitted electron, then V_(1):V_(2) is

E^@ for F_2 + 2e rarr 2F^- is 2. 8 V, E^@ for 1/2 F_2 +e rarr F^- is .

E^(@) for F_(2)+2e^(-) hArr 2F^(-) is 2.8V,E^(@) for (1)/(2)F+e^(-)=F^(-) is -