A chord attached to a vibrating form divides it into 6 loops, when its tension is 36 N . The tension at which it will vibrate in 4 loops is
a.24 N
b.36 N
c.64 N
d.81 N
A leaf which contains only green pigments is illuminated by a laser light of wavelength 0.6328 mu m. It would appear to :
a.black
b.green
c.brown
d.red
Work function of a metal is the:
a.Energy required by an electron to get absorbed in the metal surface.
b.Minimum energy required by an electron to escape from the metal surface.
c.Energy required by an electron to be retained in the metal surface.
d.Maximum energy required by an electron to escape from the metal surface.