Q52.A 50 watt bulb emits monochromatic red light of wavelength of 795 nm. The number of photons emitted per second by the bulb is ๐ฅร 1020 . The value of ๐ฅ is _____ . (Nearest integer) [Given : h = 6 . 63 ร 10-34Js and ๐= 3 . 0 ร 108 ms-1
What This Question Tests
This question involves calculating the energy of a single photon from its wavelength and then determining the total number of photons emitted per second by a light bulb of given power.
Concepts Tested
Formulas Used
E = hc/ฮป
Power = (Number of photons per second) * E
๐ NCERT Sections This Tests
11.4 โ Monochromatic Light Of Wavelength 632.8 Nm Is Produced By A
Physics Class 12 ยท Chapter 11
11.4 Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW. (a) Find the energy and momentum of each photon in the light beam, (b) How many photons per second, on the average, arrive at a target irradiated by this beam? (Assume the beam to have uniform cross-section which is less than the target area), and (c) How fast does a hydrogen atom have to travel in order to have the same momentum as that of the photon?
12.5 โ A Hydrogen Atom Initially In The Ground Level Absorbs A Photon,
Physics Class 12 ยท Chapter 12
12.5 A hydrogen atom initially in the ground level absorbs a photon, which excites it to the n = 4 level. Determine the wavelength and frequency of photon.
12.3 โ A Difference Of 2.3 Ev Separates Two Energy Levels In An Atom. What
Physics Class 12 ยท Chapter 12
12.3 A difference of 2.3 eV separates two energy levels in an atom. What is the frequency of radiation emitted when the atom make a transition from the upper level to the lower level?
๐ Question Details
- Chapter
- Atomic Structure
- Topic
- Energy of a photon and photon count
- Year
- 2021
- Shift
- 01 Sep Shift 2
- Q Number
- Q52
- Type
- Numerical
- NCERT Ref
- Class 11 Chemistry Ch 2: Atomic Structure
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