The power of a concave lens is_______________?
A. real
B. virtual
C. positive
D. negative
Unit of power of a lens is________________?
Unit of power of a lens is________________?
A. meter
B. watt
C. diopter
D. horsepower
The diameter of a lens is called________________?
The diameter of a lens is called________________?
A. focal length
B. principal axis
C. aperture
D. radius of curvature
A lens which converges a beam of parallel rays to a point is called______________?
A lens which converges a beam of parallel rays to a point is called______________?
A. diverging (or concave) lens
B. converging (or convex) lens
C. plano concave lens
D. plano convex lens
Electron moves in the orbit as________________?
Electron moves in the orbit as________________?
A. Simple vibratory motion
B. Standing wave motion
C. Vibratory motion like up and down
D. S.H.M likes the sound
Compton effect proves the________________?
Compton effect proves the________________?
A. Photon theory of light
B. Dual nature of light
C. Wave nature of light
D. Uncertain nature of light
The energy radiated is directly proportional to the fourth power of Kelvins temperature is________________?
The energy radiated is directly proportional to the fourth power of Kelvins temperature is________________?
A. Karl-Weins law
B. Rayleigh-Jeans law
C. Stephens law
D. Plancks
For confinement of electron in a box of radius 10-14m the electron, speed should be_____________?
For confinement of electron in a box of radius 10-14m the electron, speed should be_____________?
A. 107m/sec
B. Should be greater than the speed of light.
C. Be zero
D. Not be wave-like
The uncertainty in momentum & position is due to its_____________?
The uncertainty in momentum & position is due to its_____________?
A. Property of matter and radiation
B. Two-dimensional motion
C. Emission of the certain wavelength
D. Very high velocity
A three-dimensional image is obtained by________________?
A three-dimensional image is obtained by________________?
A. Electron microscope
B. Scanning electron microscope
C. Magnetic imaging
D. None of the above