Wave Nature of Light

Wave Nature of Light

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Multiple Choice

In the equation PE = mgh, what does the “g” mean?

• Acceleration due to gravity

• Force of gravity

• Weight of the object

Multiple Choice

A rock has 10 J of potential energy on top of a roof. If it is dropped and lands with only 8 joules of kinetic energy, how much work did air resistance do on the rock?

• -18 J

• -10 J

• -8 J

• -2 J

Multiple Choice

A woman lifts 20 bricks, each of weight 6N.
What other information is needed to calculate the useful work done in lifting the bricks?

• the distance she lifts the bricks
• the mass of the bricks
• the time taken to lift the bricks
• the volume of the bricks

Multiple Choice

An airplane accelerates down a runway at 3.20 m/s/s
for 8 s until it finally lifts off the ground.
Determine the velocity at take-off.

• 0.4 m/s
• 25.6 m/s
• 2.5 m/s

Multiple Choice

what is diffraction

• is a soild liquid gass

• is a beam of light that is spread out and passes through an object

• a beam of light

Multiple Choice

Different colors of light correspond to different light:

• Wavelengths

• Intensities

• Amplitudes

• Velocities

Multiple Choice

What is the speed of light?

• 3.0x10⁸ ms

• 3.0x10⁸ m/s

• 6.626x10^-34 Js

• 6.626x10^-34 J/s

Multiple Choice

Red light has a wavelength of 675 x 10^-9 m. What is its frequency?

• 2.03x10¹¹ m

• 4.44x10¹⁴ Hz

• 4.44x10¹⁴ nm

• 2.03x10¹¹ Hz

Multiple Choice

The frequency of violet light is 7.5x10¹⁴ Hz. What is its wavelength?

• 4.0x10^-7 m

• 4.0x10⁷ m

• 2.25x10²³m

• 2.25x10²³ Hz

Multiple Choice

A star is moving towards Earth

• Red shift

• Blue Shift

• Neutral

Multiple Choice

A star is moving away from Earth

• Blue shift

• Red Shift

• Stationary

Multiple Choice

Which situation will result in the highest observed frequency?

• Observer moves at 20 m/s towards sound source.

  Sound source is motionless.

• Observer moves at 20 m/s towards sound source.

  Sound source moves at 20 m/s towards the observer.

• Observer is motionless.

  Sound source moves at 20 m/s towards the observer.

• Observer is motionless.

  Sound source moves 20 m/s away from the observer.

Multiple Choice

A car moves at 20 m/s away from a whistle. The whistle is stationary. The whistle makes a sound with a frequency of 500 Hz. The speed of sound in air is 330 m/s.

What is the frequency observed by the driver of the car?

• 530 Hz

• 470 Hz

• 520 Hz

Multiple Choice

A car moves at 20 m/s away from a whistle. The whistle is stationary. The whistle makes a sound with a frequency of 500 Hz. The speed of sound in air is 330 m/s.

What is the frequency observed by the driver of the car?

• 530 Hz

• 470 Hz

• 520 Hz

• 480 Hz