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viva [34]
3 years ago
10

Listed following are various physical situations that describe how light interacts with matter. Match these to the appropriate c

ategory.1) TRANSMISSION?-visible light meets clear glass-visible light does not pass through a black wall-red light hits a red sweatshirt-light comes from your computer screen-cell phone signals pass through walls-blue light hits a red sweatshirt-white light hits a white piece of paper-light comes from a light bulb
Physics
1 answer:
jasenka [17]3 years ago
7 0

Answer:

TRANSMISSION-

visible light meets clear glass

-cell phone signals pass through walls-

Explanation:

Transmission means that light actually passes through an object. Light in this context refers to electromagnetic radiation. All the radiation found in the electromagnetic spectrum are generally called light. This includes radio waves used in telecommunication.

White light is transmitted through glass because it actually passes through the glass.

Passage of cell phone signals through walls is also a typical example of transmission of light.

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At a particular instant, a moving body has a kinetic energy of 295 J and a momentum of magnitude 25.1 kg · m/s.(a)What is the sp
motikmotik

Answer:

a) 23.51 m/s

b) 1.07 kg

Explanation:

Parameters given:

Kinetic energy, K = 295 J

Momentum, p = 25.1 kgm/s

a) The kinetic energy of a body is given as:

K = \frac{1}{2} mv^2

where m = mass of the body and v = speed of the body

We know that momentum is given as:

p = mv

Therefore:

K = 1/2 * pv

=> v = 2K / p

v = (2 * 295) / 25.1 = 23.51 m/s

The velocity of the body at that instant is 23.51 m/s.

b) Momentum is given as:

p = mv

=> m = p / v

m = 25.1 / 23.51  = 1.07 kg

The mass of the body at that instant is 1.07 kg

5 0
3 years ago
there are 1.6 km in a mile. the distance between two cities is 248 miles. How many kilometers apart are the two cities?
podryga [215]
1.6 X 248=399.117
hope this helps

3 0
3 years ago
How can I shorten this and for it to sill make sense?
Julli [10]

Answer:

Radiation is the emission or transmission of energy in the form of waves.

Explanation:

.

8 0
3 years ago
Read 2 more answers
The efficiency of a light source is the percentage of its energy input that gets radiated as visible light. if some of the blue
Anestetic [448]

The efficiency of a light source is the percentage of its energy input that gets radiated as visible light if some of the blue light in an led is used to cause a fluorescent material to glow the overall efficiency of the LED decreases.

How efficient is LED?

Different wavelengths that correlate to different visible colours are used in LED light therapy. Various shades pierce the skin at different rates.

  1. Your skin's outermost layer is impacted by blue light.
  2. Yellow light is more enveloping.
  3. Red light penetrates your skin more deeply.
  4. The deepest penetrating light is near-infrared.

Different LED hues have various effects. For instance, according to experts red LED light therapy has the potential to reduce inflammation and boost collagen formation, which declines with age and is crucial for maintaining youthful-looking skin.

Acne-causing bacteria may be destroyed by a blue LED light therapy (P. acnes).

Hence the answer is the overall efficiency of the LED decreases.

Learn more about wavelength here,

brainly.com/question/1263539

# SPJ4

7 0
2 years ago
Twenty grams of a solid at 70°C is place in 100 grams of a fluid at 20°C. Thermal equilibrium is reached at 30°C.
zaharov [31]

Answer:

c. is more than that of the fluid.

Explanation:

This problem is based on the conservation of energy and the concept of thermal equilibrium

heat= m s \Delta T


m= mass

s= specific heat

\DeltaT=change in temperature

let s1= specific heat of solid and s2= specific heat of liquid

then

Heat lost by solid= 20(s_1)(70-30)=800s_1


Heat gained by fluid=100(s_2)(30-20)=1000s_2


Now heat gained = heat lost

therefore,

1000 S_2=800 S_1

S_1=1.25 S_2

so the specific heat of solid is more than that of the fluid.

8 0
4 years ago
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