Physics Grade 12 Sheet

What is the energy associated with a light quantum that has a wavelength of 5.0 × 10^-7m? (h = 6.63 × 10^-34 J⋅s)

• 4.0 × 10^-19 J

• 3.3 × 10^-19 J

• 1.5 × 10^-19 J

• 1.7 × 10^-19 J

What is the frequency of a photon with an energy of 1.7 × 10^-19 J? (h = 6.63 × 10^-34 J⋅s)

• 3.2 × 10¹⁴ Hz

• 2.6 × 10¹⁴ Hz

• 4.4 × 10¹⁴ Hz

• 6.8 × 10¹⁴ Hz

What is the energy of a photon whose frequency is 6.0 × 10²⁰ Hz? (h = 6.63 × 10^-34 J⋅s;

1 eV = 1.60 ⋅ 10¹⁹ J)

• 1.6 MeV

• 2.5 MeV

• 3.3 MeV

• 4.8 MeV

According to the Rutherford model of the atom, most of the volume of an atom

• is empty space

• is occupied by the nucleus.

• contains positive charges

• excludes electrons.

According to the Rutherford model of the atom, what is the concentration of positive charge and mass?

• alpha particle

• radius

• positron

• nucleus

Which statement about Rutherford's model of the atom is NOT correct?

• The model states that positive charge is unevenly distributed.

• The model shows that electrons orbit the nucleus as planets orbit the sun.

• The model explains spectral lines.

• The model states that atoms are unstable.

When a high voltage is applied to a low-pressure gas, causing it to glow, it will emit what type of spectrum?

• line emission

• line absorption

• continuous

• monochromatic

Which statement about line-emission spectra is correct?

• All the lines are evenly spaced

• All noble gases have the same spectra.

• Only gases emit emission lines.

• All lines result from discrete energy differences.

When light from argon gas is passed through a prism

• a series of discrete bright lines is observed.

• a continuous spectrum is observed

• a series of dark lines imposed on a continuous spectrum is observed

• an absorption spectrum is produced.

The wavelengths contained in an emission spectrum

• are the same for all elements.

• are characteristic of the element emitting the light.

• are the same for all atomic gases.

• form dark lines on a continuous spectrum.