The photons emitted by a source of light do not all have the same energy. Is the source monochromatic? Give your reasoning.

The energy emitted by a source is in the form of

A source of light is emitting photons. Does all the photons emitted have the same energy? Is the source monochromatic? Explain.

Select best monochromatic source of light.

Photon Counts Emitted By A Source Per Second

When the intensity of a light source is increased (a) the number of photons emitted by the source in unit time increases (b) the total energy of the photons emitted per unit time increases (c) more energetic photons are emitted (d) faster photons are emitted

Name two energy sources that you consider pollution free,give reason

Mention a source of light in which light is emitted by spontaneous emission.

According to Planck's quantum theory of light, every source of radiation emits photons (i.e., packets of energy ) which travel in all directions with the same speed (i.e., speed of light). Each photon is of energy E=hv=hc//lambda , where h is Planck's constant, v is the frequency and lambda is wavelength of radiation emitted. The photons emitted from different sources of radiation are different. Read the above passage and answer the following questions: (i) on what factors does the number of photons emitted per second from a source of radiations depends? (ii) Why are the high energy photons not vissible to eye? (iii) Which basic values do you learn from this study?