Electromagnetic Waves

Electromagnetic waves vary in

• the speed they travel in a vacuum.

• wavelength and frequency.

• the way they reflect.

• the orientation of their electric and magnetic fields.

Answer explanation

Electromagnetic waves vary in wavelength and frequency, which are inversely proportional to each other according to the wave equation c = λf, where c is the speed of light, λ is the wavelength, and f is the frequency.

Tags

NGSS.HS-PS4-1

To calculate the frequency of an electromagnetic wave, you need to know the speed of the wave and its

• wavelength.

• intensity.

• refraction.

• amplitude.

Answer explanation

To calculate the frequency of an electromagnetic wave, you need to know the speed of the wave and its wavelength.

Tags

NGSS.HS-PS4-1

An electromagnetic wave in a vacuum has a wavelength of 0.07m. What is its frequency?

• f= 3.0x 10^8 m/s

• f= 3.0x 10^9Hz

• f=4.3x 10^9Hz

• f=4.3x 10^8m/s

Answer explanation

Frequency (f) = Speed of light (c) / Wavelength (λ). Given c = 3.0 x 10^8 m/s and λ = 0.07m, f = 3.0 x 10^8 / 0.07 = 4.3 x 10^9Hz.

Tags

NGSS.HS-PS4-1

Light acts like

• a wave.

• a particle.

• Both a wave and a particle

• neither a wave nor a particle.

Answer explanation

Light exhibits both wave-like and particle-like behavior, known as wave-particle duality. It can behave as a wave or a particle depending on the experiment conducted.

Tags

NGSS.HS-PS4-3

Infrared rays have a shorter wavelength than

• Ultraviolet ray.

• X-rays.

• radar waves.

• gamma rays

Answer explanation

Infrared rays have a shorter wavelength than radar waves, making radar waves the correct choice.

Tags

NGSS.HS-PS4-1

The full range of frequencies of electromagnetic radiation is called

• visible light.

• radio waves.

• the electromagnetic spectrum.

• invisible radiation.

Answer explanation

The correct answer is 'the electromagnetic spectrum' because it encompasses all frequencies of electromagnetic radiation, not just visible light or radio waves.

Tags

NGSS.HS-PS4-4

The waves with the longest wavelengths in the electromagnetic spectrum are

• Infrared rays.

• radio waves

• gamma rays

• X-rays

Answer explanation

The waves with the longest wavelengths in the electromagnetic spectrum are radio waves.

The visible light spectrum ranges between

• radar waves and X-rays.

• television waves and infrared rays.

• infrared rays and ultraviolet rays.

• ultraviolet rays and gamma rays.

Answer explanation

The correct answer is the visible light spectrum ranges between infrared rays and ultraviolet rays.

Light in the form of a particle that has discrete amount of energy is called a

• Charm

• Photon

• Exciton

• Muon

Answer explanation

A particle of light with discrete energy is called a photon, making it the correct choice among the options provided.

Tags

NGSS.HS-PS4-3

What is the electromagnetic spectrum?

• The full range of wave frequencies of electromagnetic radiation is called the electromagnetic spectrum.

• The rainbow

Answer explanation

The electromagnetic spectrum refers to the full range of wave frequencies of electromagnetic radiation.

Tags

NGSS.HS-PS4-4

NGSS.HS-PS4-3