Review Chemistry TEK 6B

What is the mathematical relationship between energy and frequency of light?

• E = mc^2

• E = 1/f

• E = λf

• E = hf

Answer explanation

The mathematical relationship between energy and frequency of light is given by the equation E = hf, where E is the energy, h is Planck's constant, and f is the frequency of light. This equation is derived from the concept of photons, which are discrete packets of energy that make up light. The other options do not correctly represent the relationship between energy and frequency of light.

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NGSS.HS-PS4-1

What is the mathematical relationship between energy and wavelength of light?

• E = λ/hc

• E = λc/h

• E = h/λc

• E = hc/λ

Answer explanation

The mathematical relationship between energy (E) and wavelength (λ) of light is given by the Planck's equation, E = hc/λ, where h is the Planck's constant and c is the speed of light. This equation shows that energy is inversely proportional to the wavelength, meaning as the wavelength increases, the energy decreases and vice versa.

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NGSS.HS-PS4-1

What is the mathematical relationship between frequency and wavelength of light?

• speed of light = frequency / wavelength

• speed of light = frequency x wavelength

• speed of light = frequency + wavelength

• speed of light = wavelength / frequency

Answer explanation

The mathematical relationship between frequency and wavelength of light is given by the equation: speed of light = frequency x wavelength. This equation shows that the speed of light is equal to the product of the frequency and wavelength of light, which is the correct choice among the given options.

Tags

NGSS.HS-PS4-1

Which property of light increases as its energy increases?

• frequency

• speed

• amplitude

• wavelength

Answer explanation

The energy of light is directly proportional to its frequency, according to Planck's equation (E=hv). Therefore, as the energy of light increases, its frequency also increases. The speed of light is constant, and neither the amplitude nor the wavelength is directly related to the energy of light.

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NGSS.HS-PS4-1

Which property of light decreases as its wavelength increases?

• frequency

• speed

• intensity

• amplitude

Answer explanation

The property of light that decreases as its wavelength increases is frequency. This is because the speed of light is constant, so if the wavelength increases, the frequency must decrease to compensate. This is based on the formula for wave speed, which is speed equals frequency times wavelength. Therefore, the correct answer is frequency.

Tags

NGSS.HS-PS4-1

Which property of light decreases as its frequency decreases?

• wavelength

• intensity

• speed

• amplitude

Answer explanation

The property of light that decreases as its frequency decreases is the wavelength. This is because the wavelength and frequency of light are inversely proportional to each other. When the frequency of light decreases, its wavelength increases, and vice versa. Therefore, the correct answer is 'wavelength'.

Tags

NGSS.HS-PS4-1

What is the unit of energy in the electromagnetic spectrum?

• electron

• photon

• proton

• neutron

Answer explanation

The unit of energy in the electromagnetic spectrum is the photon. Photons are elementary particles that carry electromagnetic energy. They are the basic units of light and other forms of electromagnetic radiation, such as radio waves, microwaves, and X-rays. Electrons, protons, and neutrons are not units of energy in the electromagnetic spectrum, as they are particles with mass and charge, while photons are massless and chargeless.

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NGSS.HS-PS4-3

What is the unit of frequency in the electromagnetic spectrum?

• hertz

• watt

• volt

• ampere

Answer explanation

The unit of frequency in the electromagnetic spectrum is hertz. Hertz (Hz) is used to measure the number of cycles per second of a wave, such as electromagnetic waves. The other options, watt, volt, and ampere, are units of power, electric potential, and electric current, respectively, and are not related to frequency.

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NGSS.HS-PS4-1

What is the unit of wavelength in the electromagnetic spectrum?

• meters

• inches

• kilometers

• seconds

Answer explanation

The unit of wavelength in the electromagnetic spectrum is meters. Wavelength is a measure of the distance between two consecutive points of a wave, such as the distance between two consecutive crests or troughs. In the electromagnetic spectrum, this distance is typically measured in meters, although other units like nanometers or angstroms may be used for specific ranges of the spectrum.

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NGSS.HS-PS4-1

Which property of light determines its color?

• wavelength

• speed

• intensity

• frequency

Answer explanation

The color of light is determined by its wavelength. Different wavelengths of light are perceived as different colors by the human eye. For instance, a shorter wavelength corresponds to blue light, while a longer wavelength corresponds to red light. Therefore, the correct answer is 'wavelength'.

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NGSS.HS-PS4-1