A laser light of wavelength 660 nm is us...

A laser light of wavelength 660 nm is used to weld Retina detachment. If a laser pulse of width 60 ms and power 0.5 kW is used, the approximate number of photons in the pulse are (Take Planck's Constant, `h=6.62xx10^(-34)Js`)

`10^(22)`

`10^(19)`

`10^(20)`

`10^(18)`

Text Solution

Verified by Experts

The correct Answer is:

Topper's Solved these Questions

NEET MOCK TEST 5
NTA MOCK TESTS|Exercise PHYSICS - SINGLE CHOICE|45 Videos
NEET MOCK TEST 9
NTA MOCK TESTS|Exercise PHYSICS|45 Videos

Similar Questions

Explore conceptually related problems

A laser emits a pulse of light with energy 5.0 xx 10^(3)J . Determine the number of photons in the pulse if the wavelength of light is 480 nm.

What is the number of significant figures in Avogadro's number (6.0 xx 10^(23)) and Planck's constant (6.62 xx 10^(-34) J s) .

A ball of mass 0.12 kg is moving with a speed 20 m//s . Calculate the de Broglie wavelength. (planck constant h= 6.62xx10^(-34)J.s )

A ruby laser produces radiations of wavelength, 662.6nm in pulse whose duration are 10^(-9)s . If the laser produces 0.39 J of energy per pulse, how many protons are produced in each pulse?

A laser beam of output power 'P' consists only of wavelength lambda . If Planck's constant is h and the speed of light is c , then the number of photons emitted per second is

A monochromatic source emitting light of wavelength, 600nm, has a power output of 66W. Caculate the number of photons emitted by this source in 2minuts. Use h=6.6xx10(-34)Js .

One milliwatt of light of wavelength 4560 A is incident on a cesium surface. Calculate the photoelectric current liberated assuming a quantum efficiency of 0.5 %. Given Planck's constant h=6.62xx10^(-34)J-s and velocity of light c=3xx10^(8)ms^(-1) .

A radiostation broadcasts at frequency of 100 MHz. If the radiating power of the transmitter is 66.6 KW, then the number of photons radiated per second is [ Take h=6.66xx10^(-34)Js ]

The de - Broglie wavelength of a ball of mass 120 g moving at a speed of "20 m s"^(-1) is (Planck's constant h=6.6xx10^(-34)Js )

NTA MOCK TESTS-NEET MOCK TEST 8-PHYSICS - SINGLE CHOICE

If two mirrors are keps at 60^circ to each other, then the number of i...
Text Solution
|
If the balance length corresponding to points B and C is 40 cm on the ...
Text Solution
|
A laser light of wavelength 660 nm is used to weld Retina detachment. ...
Text Solution
|
The amplitude and time period in SHM are 0.8 cm and 0.2 sec respective...
Text Solution
|
A circuit ABCD is held perpendicular to the uinform magnetic field of ...
Text Solution
|
Half lives of two isotopes X and Y of a material are known to be 2 xx ...
Text Solution
|
Gravitational potential V versus distance r graph is represented in th...
Text Solution
|
Four persons K,L,M,N are initially at the four corners of a square of ...
Text Solution
|
A ball of mass 2 kg and another of mass 4 kg are dropped together from...
Text Solution
|
Two magnets of magnetic moments 4Am^(2) and 3Am^(2) are joined to form...
Text Solution
|
With respect to the potential of emitter, base and collector, a NPN tr...
Text Solution
|
400 c c volume of gas having gamma=5/2 is suddenly compressed to 100 c...
Text Solution
|
The endpoints of a conducting string (shaped as a circular loop) of co...
Text Solution
|
An air bubble of radius 1 mm is located at a depth of 20 cm below wate...
Text Solution
|
A man of weight mg is moving up in a rocket with acceleration 4 g . Th...
Text Solution
|
A small conducting sphere of radius r is lying concentrically inside a...
Text Solution
|
The deflection in a moving coil galvanometer is
Text Solution
|
If for hydrogen C(P) - C(V) = m and for nitrogen C(P) - C(V) = n, wher...
Text Solution
|
A positively charged ball hangs from a long silk thread. Electric fiel...
Text Solution
|
Which of the following graphs represents the motion of a particle movi...
Text Solution
|