Question:- Sound waves in air are A. transverse B. longitudinal C. electromagnetic D. polarised
Answer:- Option B
Question:- Magnetism at the centre of a bar magnet is A. minimum B. maximum C. zero D. minimum or maximum
Answer:- Option C
Question:- Of the following properties of a wave, the one that is independent of the other is its A. amplitude B. velocity C. wavelength D. frequency
Answer:- Option A
Question:- Lux is the SI unit of A. intensity of illumination B. luminous efficiency C. luminous flux D. luminous intensity
Answer:- Option A
Question:- What is intensity illumination?
Answer:- The illumination intensity indicates the luminous flux which strikes a surface. The utilised unit of measure is lux: 1 lx = 1 lm/m² (lumens per square meters).
Question:- What are the units of intensity of light?
Answer:- Candela is the SI unit of intensity of light.
Question:- What is intensity and its SI unit?
Answer:- Intensity is denoted by “I”. The S.I unit of intensity is Watt per square meter ( W / m 2 ) o r ( kgs - 3 )
Question:- What is the symbol of intensity?
Answer:- The SI unit of luminous intensity is the candela (cd), an SI base unit.
Question:- What is the symbol of luminous intensity?
Answer:- Luminous intensity typically is represented by the symbol Iν, where the subscript ν denotes a photometric quantity, and its unit is the candela, an SI base unit (1 cd = 1 lumen/steradian, where the steradian is a measure of solid angle).
Question:- Which unit is lumen?
Answer:- The lumen (symbolized lm) is the International Unit of luminous flux. It is defined in terms of candela steradians (cd multiplied by sr). One lumen is the amount of light emitted in a solid angle of 1 sr, from a source that radiates to an equal extent in all directions, and whose intensity is 1 cd.
Question:- How do you convert candela to lux?
Answer:- A candela steradian per square meter (cd·sr·m⁻²) is the derived SI unit of illuminance and luminous emittance, measuring luminous flux per unit area and equal to 1 lux. One lux is equal to one lumen per square meter: 1 lx = 1 lm/m² = 1 cd·sr·m⁻².