PHOTOMETRY

It is the science of measuring visible light.

• Radiometry

• Photometry

• Galvanometry

• Calorimetry

It is the science of measuring light in any portion of the electromagnetic spectrum.

• Photometry

• Radiometry

• Calorimetry

• Galvanometry

What is the frequency range of a visible light?

• 4-7.5x10^14

• 10^17x10^20

• 1-7.5x10^14

• 4-7.5x10^20

Which of the following EM wave has the highest frequency?

• X-rays

• infrared

• radio waves

• visible light

Which of the following EM wave has the lowest frequency?

• X-rays

• infrared

• radio waves

• visible light

Like all other forms of energy , light can also be measured.

• TRUE

• FALSE

The luminous intensity is measured in a unit lm called lumen.

• TRUE

• FALSE

680 Lumens of green light is equal to 2 watts.

• TRUE

• FALSE

Which of the following photometry parameter has a unit of Candela or lumen per steradian?

• Luminous flux

• Luminous efficiency

• Luminous intensity

• Luminous light

It is the ratio of the luminous flux emitted by the source to the electric power given to it.

• Luminous flux

• Luminous efficiency

• Luminous intensity

• Luminous light