Properties of light and electrons quiz

Which of the following is a property of light?

• It has mass

• It travels in a straight line in a vacuum

• It cannot be reflected

• It does not have energy

Answer explanation

Light travels in a straight line in a vacuum due to the absence of obstacles or medium. This property is fundamental to understanding light's behavior, unlike the incorrect options that state it has mass, cannot be reflected, or lacks energy.

Tags

NGSS.HS-PS4-3

What is the unit of frequency in the context of wave properties of light?

• Meters

• Seconds

• Hertz

• Joules

Answer explanation

The unit of frequency is Hertz (Hz), which measures the number of cycles per second. In the context of light waves, frequency is crucial for determining properties like color and energy.

Tags

NGSS.HS-PS4-1

What is the symbol for wavelength?

Answer explanation

The symbol for wavelength is represented by \( \lambda \). Other symbols like \( \nu \) denote frequency, \( c \) is the speed of light, and \( E \) represents energy. Thus, \( \lambda \) is the correct choice.

Tags

NGSS.HS-PS4-1

Which equation is used to calculate the energy of a photon?

Answer explanation

The energy of a photon is calculated using the equation E = hν, where E is energy, h is Planck's constant, and ν is the frequency of the photon. This distinguishes it from other equations listed.

Tags

NGSS.HS-PS4-3

Which scientist is most closely associated with the photoelectric effect?

• Isaac Newton

• Albert Einstein

• Niels Bohr

• Marie Curie

Answer explanation

Albert Einstein is most closely associated with the photoelectric effect, as he explained it in 1905, demonstrating that light can behave as both a wave and a particle, which was crucial for the development of quantum theory.

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4

Which of the following best describes the dual nature of light?

• Light behaves only as a wave

• Light behaves only as a particle

• Light behaves as both a wave and a particle

• Light has no measurable properties

Answer explanation

Light exhibits dual nature, behaving as both a wave (demonstrated by interference and diffraction) and a particle (evident in the photoelectric effect). This duality is fundamental to understanding light's behavior.

Tags

NGSS.HS-PS4-3

Which of the following is NOT a property of electromagnetic waves?

• They can travel through a vacuum

• They require a medium to travel

• They have both electric and magnetic fields

• They travel at the speed of light in a vacuum

Answer explanation

Electromagnetic waves do not require a medium to travel; they can propagate through a vacuum. This distinguishes them from mechanical waves, which need a medium. Thus, 'They require a medium to travel' is NOT a property of electromagnetic waves.

• 25%

• 50%

• 75%

• 100%

Answer explanation

The question states that the sample contains 75% of \(^{35}\)Cl and 25% of \(^{37}\)Cl. Therefore, the percent abundance of \(^{37}\)Cl is directly given as 25%, making it the correct choice.

Answer explanation

To find the frequency (f), use the formula f = c / λ. Here, c = 3.0 x 10^8 m/s and λ = 6.0 x 10^{-7} m. Thus, f = (3.0 x 10^8) / (6.0 x 10^{-7}) = 5.0 x 10^{14} Hz, which is the correct answer.

Tags

NGSS.HS-PS4-1

Answer explanation

To find the frequency (f) of a photon, use the formula E = hf, where E is energy and h is Planck's constant. Rearranging gives f = E/h. Substituting E = 3.0 x 10^-19 J and h = 6.63 x 10^-34 J·s results in f = 4.5 x 10^14 Hz.

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3