Failure of CM

Based on the Wien's law, when the temperature increases, the phenomena that will be happen is...

• A. There is no change in the wavelength

• B. The wave length will be increase

• C. The wavelength will be decrease

• D.The frequency will be increase

• E. The frequency will be decrease

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?

• A. The frequency of star A is higher than star B

• B. The frequency of star B is higher than star A

• C. The temperature of star A and star B is same

• D. The temperature of star A is higher than star B

• E. The temperature of star A is lower than star B

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?

• red

• orange

• white

• blue

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

• rotational energy

• temperature

• distance

• composition

Which elementary particles are emitted in Photo electric effect

• Proton

• Electron

• Neutron

• Neutrino

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?

• 0.19 eV

• 4.3 eV

• 6.9 eV

• 8.4 eV

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

• X-rays have a lower frequency.

• X-rays travel faster in a vacuum.

• X-rays do not show diffraction and interference effects.

• Using the same element, photoelectrons emitted using X-rays have the greater maximum kinetic energy.

Compton effect expt. is carried out with

• x ray

• gama ray

• visible light

• heat waves

In Compton effect we use X-ray because

• it is easy to produce

• it has very small wave length

• x-ray photon has very high energy

• it is a X-ray diffraction experiment

• scattering angle equal to 90 degree

• scattering angle equal to 0 degree

• scattering angle equal to 180 degree

• scattering angle equal to 360 degree