LU 7, 8, and 9

Which ONE of the following statements about the properties of photon is WRONG?

• A photon DOES NOT have any mass.

• A photon will NOT be not deflected in electric field or magnetic field.

• Energy of photon is directly proportional to INTENSITY.

• Photons travel at the SPEED OF LIGHT in a vacuum.

Answer explanation

Energy of photon is directly proportional to FREQUENCY.

Which of the following method is the CORRECT way to convert an unit of energy from eV to J?

Choose the CORRECT word for the definition of PHOTOELECTRIC EFFECT

"Photoelectric effect is the process of ....... emission from the surface of a metal when the EM radiation (light) of higher frequency strikes its surface. "

• electron

• photon

Answer explanation

Work function is DIRECTLY proportional to threshold frequency but INVERSELY proportional to threshold wavelength.

Which ONE of the following equations represents the de Broglie wavelength for CHARGED PARTICLE?

Which ONE of the following statements about optical microscope and electron microscope is WRONG?

• Electron microscope can magnify up to 2,000,000 times while optical microscope can magnify up to 2,000 times.

• It is POSSIBLE to obtain colored images through electron microscope.

• Electron microscope uses electromagnetic lenses while optical microscope uses glass lens.

Which of the following statements is/are TRUE?

• All of the above

The electrons knock out the inner shell electrons from the target atom, creating the inner shell vacancies. When the vacancies are refilled by electrons from the outer shells, the electrons make a transition from any one of the outer shells to the inner shell vacancies and emit ............................ x-rays.

• characteristic

• continuous

The CORRECT equation used to calculate the energy for continuous X-ray is