Explanation:
It is given that,
Wavelength of red light,
Power of the laser,
(a) The energy carried by each photon is given by :
(b) Let n is the number of photons emitted by the laser per second. It can be calculated as :
Hence, this is the required solution.
Answer:
Average speed, v = 48.01 km/h
Explanation:
Given that,
Distance covered by the walker, d = 4 km
Tim taken to cover that distance, t = 53 min = 0.0833 hours
We need to find the average speed of the walker for this distance. It is given by :
Speed, v = 48.01 km/h
So, the average speed of the walker is 48.01 km/h. Hence, this is the required solution.