The image of the sun is formed on the ph...

The image of the sun is formed on the photosensitive metal with a convex lens and the photoelectric saturation current obtained is I. If,the lens is replaced by another similar lens of half the diameter and double the focal-length, then photoelectric -current will be (Assume all lightpassing through lens felling on the photosensitive metal):

`I/4`

`I/8`

`I/6`

Text Solution

Verified by Experts

Topper's Solved these Questions

PHOTOELECTRIC EFFECT AND MATTER WAVES
PHYSICS GALAXY - ASHISH ARORA|Exercise Conceptual MCQ|27 Videos
PHOTOELECTRIC EFFECT AND MATTER WAVES
PHYSICS GALAXY - ASHISH ARORA|Exercise Numerical MCQs|60 Videos
PHOTOELECTRIC EFFECT AND MATTER WAVES
PHYSICS GALAXY - ASHISH ARORA|Exercise Unsolved numerical problems|42 Videos
NUCLEAR PHYSICS AND RADIOACTIVITY
PHYSICS GALAXY - ASHISH ARORA|Exercise Concptual MCQs|48 Videos
THERMODYNAMICS LAWS & SPECIFIC HEATS OF GASES
PHYSICS GALAXY - ASHISH ARORA|Exercise Practice Exercise 3.4|11 Videos

Similar Questions

Explore conceptually related problems

An image of the sun is formed by a lens, of the focal length of 30 cm, on the metal surface of a photoelectric cell and a photoelectric current I is produced. The lens forming the image is then replaced by another of the same diameter but of focal length 15 cm. The photoelectric current in this case is

The image obtained while finding the focal length of a convex lens is ……………… .

When red light passing through a convex lens is replaced by light of blue colour, how will the focal length of the lens change ?

The image of a square hole in a screen illuminated by light is obtained on another screen with the help of converging lens. The distance of the hole from the lens is 40 cm. If the area of the image is nine times that of the hole, the focal length of the lens is

A convex lens is used to obtain a magnified image of an object on a screen . The object is at a distance 10 m from the lens . If the magnification is 19. the focal length of the lens is

A convex lens forms an image of an object on a screen 30 cm from the lens. When the lens is moved 90 cm towards the object, then the image is again formed on the screen. Then, the focal length of the lens is

The distance between a convex lens and a plane mirror is 10 cm. The parallel rays incident on the convex lens after reflection from the mirror forms image at the potical centre of the lens. Focal length of lens will be

PHYSICS GALAXY - ASHISH ARORA-PHOTOELECTRIC EFFECT AND MATTER WAVES-Discussion question

What is the speed of a photon with respect to another photon if (a) th...
Text Solution
|
which coloured light bulb, red, orange, yellow, green, or blue, emits ...
Text Solution
|
A stone is dropped from the top of a building. As the stone falls, doe...
Text Solution
|
"If the frequency of light incident on a metallic plate be doubled." E...
Text Solution
|
The frequency and the intensity of a beam of light falling on the surf...
Text Solution
|
Let be the maximum kinetic energy of photoelectrons emitted by light o...
Text Solution
|
When stopping potential is applied in an experiment on photoelectric e...
Text Solution
|
If the frequency of light in a photoelectric experiment is doubled the...
Text Solution
|
A cesium photocell, with a steady potential difference of 60 V across ...
Text Solution
|
A point source of light is used in a photoelectric effect. If the sour...
Text Solution
|
A metal surface is illuminated by a light of given intensity and frequ...
Text Solution
|
A point source causes photoelectric effect from a small metal plate. W...
Text Solution
|
The stopping potential for acertain photosensitive metal is Vq when th...
Text Solution
|
The collector plate in an experiment of photoelectric effect is kept v...
Text Solution
|
Which electrons are emitted in the photoelectric effect
Text Solution
|
Light of two different frequencies whose photons have energies 1eV and...
Text Solution
|
The image of the sun is formed on the photosensitive metal with a conv...
Text Solution
|
When monochromatic light of wavelength lambda illuminates a metal surf...
Text Solution
|
Accprding to Einste in theory of photoelectric effect, light is not be...
Text Solution
|
According to Einstein's photoelectric equation , the graph between the...
Text Solution
|