A. Ordinary water
B. Heavy water
C. Lead
D. Aluminum
A. Proton
B. electron
C. neutron
D. a-particle
A. Line spectrum of atoms
B. Production of x-rays.
C. Diffraction by crystalline solids
D. Photoelectric effect
A. Refrigeration
B. Aerosol spray
C. Plastic foam industry
D. All of above
A. It will remain under the water, when it will displace more water than its weight
B. the density of needle is less than that of water
C. due to surface tension
D. due to its shape
A. C/R
B. R/C
C. 1/RC
D. 1/ 2RC
A. Einstein
B. Galileo
C. Newtons
D. Plank