IB Physics Topic 4

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

NGSS.HS-PS4-3

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

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

• coherence
• interference
• polarisation
• refraction 

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NGSS.HS-PS4-5

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

A pipe, open at both ends, has a length L. The speed of sound in the air in the pipe is v. The frequency of vibration of the fundamental (first harmonic) standing wave that can be set up in the pipe is 

• v/2L
• L/2v
• 4v/L
• L/4v

Tags

NGSS.HS-PS4-1

Which graph correctly shows how the acceleration a of a particle undergoing SHM varies with its displacement x from its equilibrium position? 

• A
• B
• C
• D

The wavelength of a standing (stationary) wave is equal to  

• the distance between adjacent nodes. 
• twice the distance between adjacent nodes. 
• half the distance between adjacent nodes.
• the distance between a node and an adjacent antinode. 

Tags

NGSS.HS-PS4-1

Unpolarized light is shone through two identical polarizers whose axes are parallel. 
The ratio I/I_o is

• 100 %.
• 50%.
• 25%.
• 0%. 

For a system executing simple harmonic motion, the restoring force acting on the system is 

• proportional to the displacement of the system from equilibrium.
• amplitude of oscillation. 
• elastic potential energy. 
• frequency of oscillation.