NEET Exam  >  NEET Questions  >  A 200 W sodium street lamp emits yellow light... Start Learning for Free
A 200 W sodium street lamp emits yellow light of wavelength 0.6micrometre. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is? Answer is 1.5 x 10^20. Can anybody answer this?
Most Upvoted Answer
A 200 W sodium street lamp emits yellow light of wavelength 0.6microme...
Give that,

only 25% 200 W converter electrical energy into light of yellow colour
(hc / λ) x N = 200 x 25/100

Where N is the no. of photons emitted per second, h = plank’s constant,
c, speed of light

N = 200 x 25 / 100 x λ / hc
= 200 x 25 x 0.6 x 10⁻⁶ / (100 x 6.2 x 10⁻³⁴ x 3 x 10⁸)
= 1.5 x 10²⁰...
Attention NEET Students!
To make sure you are not studying endlessly, EduRev has designed NEET study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in NEET.
Explore Courses for NEET exam

Top Courses for NEET

A 200 W sodium street lamp emits yellow light of wavelength 0.6micrometre. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is? Answer is 1.5 x 10^20. Can anybody answer this?
Question Description
A 200 W sodium street lamp emits yellow light of wavelength 0.6micrometre. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is? Answer is 1.5 x 10^20. Can anybody answer this? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about A 200 W sodium street lamp emits yellow light of wavelength 0.6micrometre. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is? Answer is 1.5 x 10^20. Can anybody answer this? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A 200 W sodium street lamp emits yellow light of wavelength 0.6micrometre. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is? Answer is 1.5 x 10^20. Can anybody answer this?.
Solutions for A 200 W sodium street lamp emits yellow light of wavelength 0.6micrometre. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is? Answer is 1.5 x 10^20. Can anybody answer this? in English & in Hindi are available as part of our courses for NEET. Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free.
Here you can find the meaning of A 200 W sodium street lamp emits yellow light of wavelength 0.6micrometre. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is? Answer is 1.5 x 10^20. Can anybody answer this? defined & explained in the simplest way possible. Besides giving the explanation of A 200 W sodium street lamp emits yellow light of wavelength 0.6micrometre. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is? Answer is 1.5 x 10^20. Can anybody answer this?, a detailed solution for A 200 W sodium street lamp emits yellow light of wavelength 0.6micrometre. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is? Answer is 1.5 x 10^20. Can anybody answer this? has been provided alongside types of A 200 W sodium street lamp emits yellow light of wavelength 0.6micrometre. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is? Answer is 1.5 x 10^20. Can anybody answer this? theory, EduRev gives you an ample number of questions to practice A 200 W sodium street lamp emits yellow light of wavelength 0.6micrometre. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is? Answer is 1.5 x 10^20. Can anybody answer this? tests, examples and also practice NEET tests.
Explore Courses for NEET exam

Top Courses for NEET

Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev