Login
Login
Register
Questions
Unanswered
Tags
Categories
Ask a Question
Ask a Question
Recent questions tagged photometry
+3
votes
1
answer
Three light sources A, B and C emit equal amount of radiant energy per unit time.
asked
Apr 3, 2019
in
Class 11
by
kratos
photometry
class-11
+2
votes
1
answer
A student is studying a book placed near the edge of a circular table of radius R.
asked
Mar 23, 2019
in
Class 11
by
kratos
photometry
class-11
+3
votes
1
answer
A source emits 31.4 W of radiant flux distributed uniformly in all directions. The luminous efficiency is 60 lumen/watt.
asked
Mar 13, 2019
in
Class 11
by
kratos
photometry
class-11
+2
votes
1
answer
A person hears a single-frequency sound from a speaker that emits sound uniformly in all directions.
asked
Feb 26, 2019
in
Class 12
by
kratos
waves
sound
neet
class-11
jee
kvpy
photometry
jee mains
class-12
+2
votes
1
answer
As I walked through the thick, pine forest in Shimla I sensed someone following me and .............
asked
Feb 20, 2019
in
Chemistry
by
kratos
class-11
class-6
ntse
chemistry in daily life
class-7
photometry
natural vegetation of india
+3
votes
1
answer
As the wavelength is increased from violet to red, the luminosity (a) continuously increases
asked
Feb 10, 2019
in
Class 11
by
kratos
photometry
class-11
+1
vote
1
answer
Light from a point source falls on a screen. If the separation between the source and the screen is increased by 1%,
asked
Feb 6, 2019
in
Class 11
by
kratos
photometry
class-11
+2
votes
1
answer
A light source emits monochromatic light of wavelength 555 nm. The source consumes 100 W of electric power
asked
Jan 26, 2019
in
Class 11
by
kratos
photometry
class-11
+3
votes
1
answer
A 160 watt light source is radiating light of wavelength 6200 uniformly in all directions. The photon flux at a distance of 1.8 m
asked
Jan 25, 2019
in
Class 12
by
kratos
neet
class-11
kvpy
dual nature of radiation and matter
photometry
+2
votes
1
answer
The illuminance of a small area changes from 900 lumen/m^2 to 400 lumen/m^2 when it is shifted along
asked
Jan 15, 2019
in
Class 11
by
kratos
photometry
class-11
+1
vote
1
answer
A photographic plate is placed directly in front of a small diffused source in the shape of a circular disc.
asked
Jan 9, 2019
in
Class 11
by
kratos
photometry
class-11
+3
votes
1
answer
Light from a point source falls on a small area placed perpendicular to the incident light. If the area is
asked
Dec 12, 2018
in
Class 11
by
kratos
photometry
class-11
+2
votes
1
answer
Bond order of CO is eqal to bond order of
asked
Dec 10, 2018
in
JEE
by
kratos
chemical bonding
coordination compounds
class-11
jee
kvpy
molecular structure
photometry
transition elements
jee mains
class-12
+1
vote
1
answer
A room is illuminated by an extended source. The illuminance at a particular portion of a wall can be increased by (a) moving the source
asked
Nov 21, 2018
in
Class 11
by
kratos
photometry
class-11
+2
votes
1
answer
A source emits light of wavelengths 555 nm and 600nm. The radiant flux of the 555 nm part is 40 W
asked
Oct 15, 2018
in
Class 11
by
kratos
photometry
class-11
+2
votes
1
answer
A photographic plate is placed directly in front of a small diffused source in the shape of a circular disc
asked
Oct 3, 2018
in
Class 11
by
kratos
photometry
class-11
+1
vote
1
answer
A point source of light moves in a straight line parallel to a plane table
asked
Sep 10, 2018
in
Class 11
by
kratos
photometry
class-11
+3
votes
1
answer
Mark the correct options. (a) The luminous efficiency of a monochromatic source is always greater than that of a white light source of same power.
asked
Sep 5, 2018
in
Class 11
by
kratos
photometry
class-11
+3
votes
1
answer
A point source is emitting sound in all directions. The ratio of distance of two points from the point
asked
Sep 4, 2018
in
JEE
by
kratos
waves
sound
class-11
jee
sound waves
photometry
jee mains
class-12
wave optics
+2
votes
1
answer
A radiant heating lamp has a surface temperature of 1000 K with ε = 0.8. How large a surface area is needed to provide 250 W of radiation
asked
Aug 27, 2018
in
Physics
by
kratos
photometry
heat transfer rates
class-11
jee mains
class-10
thermodynamics
jee
electrical power and household circuits
icse
statistical physics
To see more, click for the
full list of questions
or
popular tags
.