Two stars A and B emits the same amount of light. The wavelength that star A emits is longer than the wavelength that star B emits. What can you conclude from that explanation?

An iron rod is heated. The colors at different temperatures are noted. Which of the following colors shows that the iron rod is at the lowest temperature?

Blackbody curves also tell astronomers about the ___ of an object (like a star).

Which elementary particles are emitted in Photo electric effect

Photons of wavelength 290 nm are incident on a metal plate. The work function of the metal is 4.1 eV.

What is the maximum kinetic energy of the emitted electrons?

When comparing X-rays with UV radiation, which statement is correct?

Compton effect expt. is carried out with

In Compton effect we use X-ray because

Compton Shift given by $$\Delta\lambda=\lambda c\left(1-Cos\alpha\right)$$  becomes maximum at