Question

Assign the proper symbol to the species.
The number of photons emitted by a bulb are 1.515 x 1020 per second. If wavelength of photon is
5000A, what is the power of bulb?
Calculate the ratio of energies of two radiation, one with 2 = 10 00nA and other with 1 - 900​

Answer 1

Answer:

60W

60J/s

Explanation:

Energy dissipated by bulb in 1 sec is equal to power.

Here we know that energy of 1 photon is equal to

E= hc/wavelength.

In 1 sec the bulb emits n number of photon to energy is equal to nhc/wavelength.

We can say that P = n×h×c/wavelength

putting all values we get P = 60 watt.