A surveyor’s device emits a laser pulse.
What is the time taken for the pulse to travel from the device to a wall 150 m away, where it is reflected, and then return to the device?

• 0.05ns 
• 0.10ns 
• 0.50μs 
• 1.0μs 

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

The period of an electromagnetic wave is 1.0ns. What are the frequency and wavelength of the wave? 

• A
• B
• C
• D

Tags

NGSS.HS-PS4-1

X and Y are two points on the surface of water in a ripple tank. A source of waves of constant frequency begins to generate waves which then travel past X and Y, causing them to oscillate. What is the phase difference between X and Y?

• 45°

• 135°

• 180°

• 270°

Tags

NGSS.HS-PS4-1

A monochromatic plane wave of speed c and wavelength λ is diffracted at a small aperture. The diagram illustrates successive wavefronts. 
After what time will some portion of the wavefront XY reach point P? 

• 3λ/2c
• 2λ/c
• 3λ/c
• 4λ/c

Tags

NGSS.HS-PS4-1

The four graphs represent a progressive wave on a stretched string.
Graphs A and B show how the displacement d varies with distance x along the string at one instant. Graphs C and D show how the displacement d varies with time t at a particular value of x.
The labels on the graphs are intended to show the wavelength λ, the period T and the amplitude a of the wave, but only one graph is correctly labelled. Which graph is correctly labelled? 

• A
• B
• C
• D

Tags

NGSS.HS-PS4-1

Which statement about sound waves in air at constant temperature is correct? 

• Amplitude is inversely proportional to velocity.
• Frequency is inversely proportional to wavelength.
• Velocity is proportional to wavelength.
• Wavelength is proportional to amplitude. 

Tags

NGSS.HS-PS4-1

The basic principle of note production in a horn is to set up a stationary wave in an air column. For the lowest note produced by a horn, a node is formed at the mouthpiece and the antinode is formed at the bell. The frequency of this note is 75 Hz. What are the frequencies of the next two higher notes for this air column? 

• A
• B
• C
• D

Tags

NGSS.HS-PS4-1

Which electromagnetic wave phenomenon is needed to explain the spectrum produced when white light falls on a diffraction grating? 

• coherence
• interference
• polarisation
• refraction 

Which statement about different types of electromagnetic wave is correct? 

• The frequency of infra-red waves is less than the frequency of blue light. 
• The frequency of radio waves is greater than the frequency of gamma rays.
• The wavelength of red light is less than the wavelength of ultraviolet waves.
• The wavelength of X-rays is greater than the wavelength of microwaves.

Tags

NGSS.HS-PS4-1

Electromagnetic waves of wavelength λ and frequency f travel at speed c in a vacuum. What describes the wavelength and speed of electromagnetic waves of frequency f / 2? 

• A
• B
• C
• D

Tags

NGSS.HS-PS4-1