Advertisements
Advertisements
Question
Nitrogen laser produces radiation at a wavelength of 337.1 nm. If the number of photons emitted is 5.6 × 1024, calculate the power of this laser.
Solution
Power of laser = Energy with which it emits photons
Power = E = `("Nhc")/lambda`
Where,
N = number of photons emitted
h = Planck’s constant
c = velocity of radiation
λ = wavelength of radiation
Substituting the values in the given expression of Energy (E)
E = `((5.6xx20^(24))(6.626xx10^(-34) " Js")(3xx10^8 " ms"^(-1)))/(337.1xx10^(-9) " m")`
= 0.3302 × 107 J
= 3.33 × 106 J
Hence, the power of the laser is 3.33 × 106 J.
APPEARS IN
RELATED QUESTIONS
Calculate the wavelength, frequency and wave number of a light wave whose period is 2.0 × 10-10s.
Arrange the following type of radiations in increasing order of frequency:
- radiation from microwave oven
- amber light from traffic signal
- radiation from FM radio
- cosmic rays from outer space and
- X-rays.
Neon gas is generally used in the signboards. If it emits strongly at 616 nm, calculate
- the frequency of emission,
- distance traveled by this radiation in 30 s
- energy of quantum and
- number of quanta present if it produces 2 J of energy.
The Balmer series in the hydrogen spectrum corresponds to the transition from n1 = 2 to n2 = 3, 4,.......... This series lies in the visible region. Calculate the wave number of line associated with the transition in Balmer series when the electron moves to n = 4 orbit. (RH = 109677 cm–1)
Chlorophyll present in green leaves of plants absorbs light at 4.620 × 1014 Hz. Calculate the wavelength of radiation in nanometer. Which part of the electromagnetic spectrum does it belong to?
Assertion (A): Black body is an ideal body that emits and absorbs radiations of all frequencies.
Reason (R): The frequency of radiation emitted by a body goes from a lower frequency to higher frequency with an increase in temperature.
The energy ratio of a photon of wavelength 3000 Å and 6000 Å is ______.
A particular station of All India Radio, New Delhi, broadcasts on a frequency of 1,368 kHz (kilohertz). The wavelength of the electromagnetic radiation emitted by the transmitter is ______
[speed of light, c = 3.0 × 108 ms−1]
A particular station of All India Radio, New Delhi, broadcasts on a frequency of 1,368 kHz (kilohertz). The wavelength of the electromagnetic radiation emitted by the transmitter is ______.
[speed of light, c = 3.0 × 108 ms−1]
The minimum uncertainity in velocity of a particle of mass 1.1 × 10-27 kg if uncertainity in its position is 3 × 10-10 cm will be _____ × 10-4 ms-1.
When a certain metal was irradiated with light of frequency 3.2 × 1016 Hz, the photoelectrons emitted had twice the kinetic energy as did photoelectrons emitted when the same metal was irradiated with light of frequency 2.0 × 1016 Hz. The light of frequency v0 for the metal is ______ × 1015 Hz.
What is the work function of the metal if the light of wavelength 4000 Å generates photoelectrons of velocity 6 × 105 ms−1 from it?
(Mass of electron = 9 × 10−31 kg
Velocity of light = 3 × 108 ms−1
Planck's constant = 6.626 × 10−34 Js
Charge of electron = 1.6 × 10−19 JeV−1)
The region in the electromagnetic spectrum where the Balmer series lines appear is ______.
