Question

15. Light behaves primarily like a wave when: EXPLAIN IT

a. travels in a vacuum.

b. interacts with matter.

Answer #1

14. The photoelectric effect shows that the nature of light is:
(explain it)
a. wave.
b. particulate.
15. Light behaves primarily like a wave when: (explain it)
a. travels in a vacuum.
b. interacts with matter.

True or false for the following:
A) Light can be totally internally reflected when it
tries to go from a less dense material
(smaller n) into a more dense material (larger
n).
B) The frequency of the light also changes when
it travels between different mediums.
C) When a light wave travels from a more dense medium (like
water) into vacuum (complete lack of matter), the velocity of the
light decreases.

Light of wavelength 612 nm in a vacuum travels 1.57 pm in a
medium of index of refraction 1.51. Find
(a) the wavelength in the medium,
(b) the optical path length,
(c) the phase difference after moving that
distance, with respect to light traveling the same distance in a
vacuum.

A plane electromagnetic wave, with wavelength 4.0 m, travels in
vacuum in the positive direction of an x axis. The
electric field, of amplitude 270 V/m, oscillates parallel to the
y axis. What are the (a) frequency,
(b) angular frequency, and (c)
angular wave number of the wave? (d) What is the
amplitude of the magnetic field component? (e)
Parallel to which axis does the magnetic field oscillate?
(f) What is the time-averaged rate of energy flow
associated with this...

A plane electromagnetic wave, with wavelength 2.5 m, travels in
vacuum in the positive direction of an x axis. The electric field,
of amplitude 270 V/m, oscillates parallel to the y axis. What are
the (a) frequency, (b) angular frequency, and (c) angular wave
number of the wave? (d) What is the amplitude of the magnetic field
component? (e) Parallel to which axis does the magnetic field
oscillate? (f) What is the time-averaged rate of energy flow
associated with this...

A plane electromagnetic wave, with wavelength 3.9 m, travels in
vacuum in the positive direction of an x axis. The
electric field, of amplitude 360 V/m, oscillates parallel to the
y axis. What are the (a) frequency,
(b) angular frequency, and (c)
angular wave number of the wave? (d) What is the
amplitude of the magnetic field component? (e)
Parallel to which axis does the magnetic field oscillate?
(f) What is the time-averaged rate of energy flow
associated with this...

Light with wavelength 700 nm travels through a vacuum (n=1). It is
normally incident upon a thin layer of oil (n=1.4), which rests
upon a thick layer of glass (n=1.5).
a) What
is the minimum thickness of oil needed to minimize the light
reflected from the oil?
b)
What is the minimum thickness of oil needed to maximize the
reflected light?

Light with
wavelength 700 nm travels through a vacuum (n=1). It is normally
incident upon a thin layer of water (n=1.33), which rests upon a
thick layer of glass (n=1.5).
a) What is the
minimum thickness of water needed to minimize the light reflected
from the water?
b) What is the
minimum thickness of water needed to maximize the reflected
light?

A sinusoidal plane electromagnetic wave having a frequency of
3.00 GHz travels in the positive x direction. If the amplitude of
the electric field is 300 V.m-1 and the speed of light in vacuum is
taken as 3.0 x 108 m.s-1, write down wave equation in terms of
E(x,t) and B(x,t), where x is in meters and t is in seconds for the
electric field and the magnetic field.

1) Which one of the following is not a property of EM
waves in a vacuum?
a) The EM wave is longitudinal, the electric and magnetic fields
oscillate along the direction of propagation.
b) The electric and magnetic fields oscillate in phase with each
other.
c) EM waves in a vacuum travel at a speed of 3.00 ×
108 m/s, independent of frequency.
2) Which one of the following statements is
correct?
a) A complete description of light requires consideration...

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