Waves

Which row correctly identifies the properties of all electromagnetic waves?

Options

What is the approximate range of wavelengths in free space for infrared radiation?

Options

A   $100\text{ nm to }400\text{ nm}$
B   $300\,\mu\text{m to }30\text{ cm}$
C   $400\text{ nm to }700\text{ nm}$
D   $800\text{ nm to }1000\,\mu\text{m}$

The diagram shows a car travelling at a constant speed in a straight line between person P and person Q from point X to point Y.

The car sounds its horn continuously as it travels. The horn emits sound of constant frequency.
Which statements about what person P and person Q hear during the motion of the car are correct?

1 Person P hears a sound of increasing frequency.
2 Person Q hears a sound of decreasing frequency.
3 Person Q always hears a sound of higher frequency than person P.

Options

A   1, 2 and 3
B   1 and 2 only
C   3 only
D   none of them

A progressive wave of frequency $300\text{ Hz}$ is travelling with a speed of $600\text{ m s}^{-1}$.
What is the phase difference between two points on the wave that are a distance of $0.50\text{ m}$ apart?

Options

A   $45^\circ$
B   $90^\circ$
C   $180^\circ$
D   $360^\circ$

A polarised beam of light with intensity $I$ is incident normally on a polarising filter.
The transmitted light has intensity $I$.
The filter is rotated about the normal axis through an angle $\theta$.
The transmitted light has intensity $0.75I$.
What is the angle $\theta$?

Options

A   $30^\circ$
B   $42^\circ$
C   $49^\circ$
D   $60^\circ$

A surveyor’s device emits a pulse of light. The light is reflected from a wall $150\text{ m}$ away.

What is the total time taken for the pulse to travel from the device to the wall and then back to the device?

Options

A   $0.05\text{ ns}$
B   $0.10\text{ ns}$
C   $0.50\mu\text{s}$
D   $1.0\mu\text{s}$

An aircraft produces a sound at a frequency of $30.0\text{ Hz}$.

The speed of sound in air is $330\text{ m s}^{-1}$.

The aircraft is directly in front of the stationary observer and travels in a straight line towards or away from the observer.

The observer hears the sound from the aircraft at a frequency of $20.0\text{ Hz}$.

What is the speed and direction of the aircraft?

Options

Which statement about longitudinal and transverse wave motion for a progressive wave is correct?

Options

A   All transverse and longitudinal waves require a medium for propagation.
B   All transverse waves travel at the same speed, but longitudinal waves can travel at different speeds.
C   In both transverse waves and longitudinal waves, a particle with zero displacement has a maximum speed.
D   In a longitudinal wave there is a net movement of particles in the direction of travel of the wave, but there is no net movement of particles in a transverse wave.

The diagram shows a progressive transverse wave on a stretched string at one instant in time.

One point on the string is labelled X.

Which point on the string is $270^\circ$ out of phase with X?

Options

A   A
B   B
C   C
D   D

Which wavelength of electromagnetic radiation in free space could be green light?

Options

A   $4.9 \times 10^{-9}\text{ m}$
B   $6.6 \times 10^{-9}\text{ m}$
C   $5.5 \times 10^{-7}\text{ m}$
D   $8.6 \times 10^{-7}\text{ m}$