Advertisements
Advertisements
Question
How many photons of frequency 1014 Hz will make up 19.86 J of energy?
Advertisements
Solution
E = 19.86 J
v = 1014 Hz
E = nhv
n = `"E"/"hv"`
= `19.86/(6.626 xx 10^-34 xx 10^14)`
= 2.997 × 1020
Number of Photons N = 3 × 1020
APPEARS IN
RELATED QUESTIONS
What is the photoelectric effect?
What is a photocell?
Define stopping potential.
Briefly discuss the observations of Hertz, Hallwachs and Lenard.
Explain how frequency of incident light varies with stopping potential.
List out the laws of photoelectric effect.
Explain the quantum concept of light.
Explain experimentally observed facts of the photoelectric effect with the help of Einstein’s explanation.
How many photons per second emanate from a 50 mW laser of 640 nm?
UV light of wavelength 1800 Å is incident on a lithium surface whose threshold wavelength is 4965 Å. Determine the maximum energy of the electron emitted.
