A. Gravity
B. Spring
C. Hand
D. All of these
A. Property of matter and radiation
B. Two-dimensional motion
C. Emission of the certain wavelength
D. Very high velocity
A. Sudden compression of gases
B. Sudden expansion of gases
C. Cooling of gases
D. Heating of gases
A. Lagging each other
B. They are at 90? phase difference
C. They have zero phase difference
D. No phase difference
A. Due to the electrostatic force of attraction
B. Due to the electrostatic force of repulsion
C. Due to a direct collision
D. Due to the gravitational force
A. equal to 45 deg
B. equal to 90 deg
C. equal to each other
D. none of the above
A. Gravitational force
B. Frictional force
C. Coulomb force
D. Centripetal force