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

Compton effect proves the________________?

A. Photon theory of light
B. Dual nature of light
C. Wave nature of light
D. Uncertain nature of light

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

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

The diameter of a lens is called________________?

A. Focal length
B. Principal axis
C. Aperture
D. Radius of curvature

Unit of power of a lens is________________?

A. Meter
B. Watt
C. Diopter
D. Horsepower

The power of a concave lens is_______________?

A. Real
B. Virtual
C. Positive
D. Negative

If a material object moves with speed of light its mass becomes ________________?

A. Equal to its rest mass
B. Double of its rest mass
C. Infinite
D. Zero

Rest mass of a photon is________________?

A. Infinite
B. Zero
C. Very small
D. 1.67 x 10-27 kg

Einstein’s photoelectric equation is given by_______________?

A. 1/2 mvmax2=hf+φ
B. 1/2 mvmax2-hf = φ
C. 1/2 mvmax2=hf-φ
D. All of above are correct