plickers: physics

what is the accleration of a car driving along a straight road that maintatins 100 km/hr for 10 sec?

0 km/hr/s

if the frequency of a particular wave is 20Hz, its period is

1/20 s

the speed of a wave can be found by multiplying its freq. by its

Wave length

the peak freq, of emitted radiation of an incandescent soild is directly proportional to

absolute temperature

spectral lines seen in the solar spectrum are due to

absorption

Is interference restricted to only some types of waves or does it occur for all types of waves?

all types of waves

when something is painted red, what color is most absorbed?

cyan

any bending of light that is not reflected or refracted is due to

diffraction

electromagnetic waves are composed of

electric and magnetic fields

If the sum of both the external torques and the external forces on an object is zero, then the object must be at rest. (t/f)

false

in vacuum, a coin and a feather fall at the same rate, would it be correct to say that equal forces of gravity act on both the coin and the feather? (1) (t/f)

false (1)

a diffraction grating separates light into its component colors by the process of

interference

Reinforcement and cancellation are terms common to wave (1)

interference (2)

Waves spread when passing through openings of various sizes. More spreading occurs for openings that are

narrow

Does the medium in which a wave travels move with the wave?

no

materials that dont transmit visible lgiht are said to be

opaque

distinguish between these different aspects of a wave: period, amplitude, WL, and frequency

period is the time from 1 crest to the next, amplitude is the distance from the midpoint to a crest, WL is the distance from 1 crest to the next and frequency is the # of crests that pass per second

which of these colors of light represents the lowest visible frequency?

red

When a red rose is held in white light, the color of its petals appears (1)

red (1)

The color of seawater is a result of the subtraction of what color? (2)

red (2)

a mirage is the result of atomospheric

refraction

clouds are white due to

scattering

what is the source of all waves

something that vibrates

what is the relationship between index of refraction and the speed of light in a material

the Index of refraction is inversely proportional to the speed of light in a material

relative to the distance of an object in front of a plane mirror, how far behind the mirror is the image

the image is the same distance behind the plane mirror as the object is in front of it

If a block is moving to the left at a constant velocity, what can one conclude?

the net force applied to the block is 0

if a car is moving with constant velocity, is it also neccessarily moving with constant speed (t/f)

true

electromagnectic radiation mostly absorbed in ordinary glass is

ultraviolet

distinguish between a converging and diverging lens

when 2 parallel rays of light pass through a converging lens, the rays bend towards each other. when they pass through a diverging lens, the rays move apart from each other