BOE_2021_ADBE (114-200 Q)

A He-Nw layer emits light at a wave length of 632.8nm and has an output power of 2.3 mw. The no of photons emitted per minute, Given h = 6.625 x 10^-34 SI units.

• 4.4x10^6 Photons/minute

• 1.7x10^5 Photons/minute

• 1.4x10^7 Photons/minute

• 5.5x10^6 Photons/minute

• Answer not known

Two sources of waves are called coherent if

• Both have the same amplitude and vibration

• Both produce waves of the same wave length

• Both produce waves having the same velocity

• Both produce waves of the same wave length having a constant phase difference

• Answer not known

The colours exhibited by a soap bubble is due to

• Reflection of light

• Refraction of light

• Interference of light

• Diffraction of light

• Answer not known

The slopes of isothermal and adiabatic curves are related as

• Isothermal curve slope = Adiabatic curve slope

• Adiabatic curve slope = y x Isothermal curve slope

• Isothermal curve = y x Adiabatic curve slope

• Adiabatic curve slope = k x Isothermal curve slope

• Answer not known

The first law of thermodynamics is a special case of

• Law of conservation of momentum

• Law of conservation of energy

• Law of heat exchange

• Charle’s law

• Answer not known

If T is the reverberation time of an auditorium of volume V' then

• T = 0.161V/A

• T = 0.5V/A

• T = 0.3V/A

• Answer not known

The reciprocal of bulk modulus is called

• Modulus of elasticity

• Hooke’s law

• Compressibility

• Poisson ratio

• Answer not known

The bulk modulus is a proportionality constant that relates the pressure acting on an object

• The shear

• The fractional change in volume

• The fractional change in length

• Young’s modulus

• Answer not known

1 horse power is equal to

• 1736W

• 716 W

• 1726 W

• 746 W

• Answer not known

The law of inertia is related to

• Newton’s first law of motion

• Newton’s second law of motion

• Newton’s third law of motion

• Law of conservation of momentum

• Answer not known