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Physics > Physics test 1 grade 10 > Flashcards

Physics test 1 grade 10 Flashcards

1
Q

What is the difference between luminous and non-luminous objects?

A

Luminous objects, for example, computers or tvs, emit their own light, while non luminous objects, such as chairs or paper, rely on other sources of light to become visible to humans. The external light source bounces off of the non luminous object and reflects into our eyes, allowing us to see.

Luminous examples: computers, TVs; Non-luminous examples: chairs, paper.

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2
Q

Fill in the blank: Some objects look black because they _______ the light.

A

absorb

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3
Q

Describe how the reflection at a mirror differs from that at a non-mirror.

A

Non-mirrors reflect light in all directions due to uneven surfaces, while mirrors reflect light regularly due to their smoothness.

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4
Q

Why do some things appear transparent?

A

They allow the light to pass directly through them.

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5
Q

What evidence justifies modeling light as a wave?

A

When water waves pass through a small gap, they spread out and diffract, similar to light.

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6
Q

What is monochromatic light?

A

Light made up of only one color (one wavelength)

This implies one wavelength.

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7
Q

How fast does light travel?

A

300,000,000 m/s (300,000 km/s)

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8
Q

How long does light take to travel 1 km?

A

0.000003 seconds

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9
Q

Why can we call the travel time of light an ‘instant’?

A

Due to its incredible speed, it seems instantaneous to humans.

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10
Q

How fast does sound travel

A

343 m / s

Calculation: 1000/3.

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11
Q

If an observer counts 10 seconds between seeing lightning and hearing thunder, how far away was the flash?

A

3.3 km

Calculation: 10/3.

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12
Q

Would the method of measuring distance using light and sound work on another planet?

A

No, conditions such as temperature and magnetic fields may cause differences.

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13
Q

How long does it take light to reach Earth from Mars?

A

182 seconds or around 3 minutes

Calculation: 54.6 million / 300,000.

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14
Q

Fill in the blank: Light can travel through _______.

A

empty space

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15
Q

What happens to light when it strikes white paper?

A

It diffuses and bounces off in all directions.

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16
Q

What happens when light strikes black paper?

A

The paper absorbs it.

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17
Q

What is the speed of light in meters per second?

A

300,000,000 m/s

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18
Q

What is the wavelength of violet light?

A

0.0004 mm

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19
Q

What is the wavelength of red light?

A

0.0007 mm

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20
Q

What does light transfer when it interacts with materials?

A

Energy
- energy is required to make light

Energy is needed to produce light.

21
Q

What are the four reflections associated with light

A

Transmission, diffuse reflection, regular reflection, absorption

22
Q

examples of non luminous objects

A

chair, bed, a waterbottle

23
Q

how do we see non luminous objects

A

We see non luminous objects because light, including daylight and other sources, bounce off of the object and some of it goes into our eyes. These objects do not emit light, rather reflect it, allowing us to see them.

24
Q

why do we see colors

A

Different
wavelengths
are received by our eye and interpreted
by our brain as different colors

25
Q

White light

A

White light is made up of a
mixture
of wavelengths.

26
Q

Evidence that light travels in straight lines

A

Evidence that light travels in straight lines includes the path of light that a laser or a sunbeam produces

27
Q

Diffuse reflection

A

If a surface is rough, diffuse reflection. happens. Instead of forming an image, the reflected light is scattered in all directions. This may cause a distorted image of the object, as occurs with rippling water, or no image at all

28
Q

Regular reflection

A

when the light falls on the smooth, shiny surface and reflects entirely within the same angle.

29
Q

absorption

A

the process in which light is absorbed and converted into energy

30
Q

transmission

A

when light travels through a material completely, like space, air, water, and clear glass

31
Q

visible light

A

all wavelengths of light that the human eye can detect

32
Q

incandescence

A

production of visible light by an object so hot that it glows

33
Q

luminescence

A

production of visible light without heat

34
Q

types of luminescence

A

fluorescence, electroluminescence, bioluminescence

35
Q

fluorescence

A

a substance absorbes shorter wavelength ultraviolet light and emits light in a visible range of wavelengths (gemstones)

36
Q

electroluminescence

A

a substance that gives off light when al electrical current passes through it (neon gas)

37
Q

bioluminescence

A

production of light by living things as a result of a chemical reaction(s) (fireflies, jellyfish)

38
Q

How does light interact with matter

A

transparent, translucent, or opaque matter

39
Q

refraction

A

occurs when light changes direction as it passes into a new medium and changes speed

40
Q

scattering

A

occurs when light bumps into tiny particles of matter and spreads out

41
Q

types of transmission

A

refraction, scattering

42
Q

why would matter heat up when light is pointed at it

A

due to the transfer of energy

43
Q

transparent matter

A

matter that transmits light without scattering it

44
Q

translucent matter

A

matter that transmits light but scatters it as it passes through

45
Q

opaque

A

matter that doesn’t let light pass through

46
Q

features of light

A

it is a form of radiation
it travels in straight lines
it transfers energy
it behaves like waves
it travels through empty space (no medium required)
it is the fasted thing

47
Q

how does light travel

A

Light exhibits characteristics of both waves and particles, the latter of which are described as packets of energy called photons. These waves, or photons, travel in narrow beams called rays. Only when light rays move from one medium to another, such as from air to water, are their linear paths altered.

48
Q

what is diffraction

A

the spreading of waves as they pass through or around an obstacle.

Physics (6 decks)

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