The answer 1 is
The best-known use of radio waves is for communication; television, cellphones and radios all receive radio waves and convert them to mechanical vibrations in the speaker to create sound waves that can be heard.Electromagnetic radiation is transmitted inwaves or particles at different wavelengths and frequencies.
the answer 2 is
Radio Waves: Instant Communication
Microwaves: Data and Heat
i think the answer number 3 is
It is all about wavelength versus tunnel diameter. The wavelength of GPS is about 20cm it would happily propagate in any normal tunnel if it could get in but the earth and other structures absorb it. AM radio (600kHz - 1500kHz) cannot propagate in any normal tunnel because the wavelength is too long (500m-200m) relative to the diameter, and thus gets reflected at the entrance. FM (100MHz ~ 3m) would propagate and it does for a while but then it suffers reflections
Answer:
A
Explanation:
SInce It is peaking at the top that's where energy is stored
Answer:
cheetah goes 52.2 m in that time.
Explanation:
<h2>
Answer: Infrared light</h2>
A dark nebula is a cloud of dust and cold gas, which does not emit visible light and hides the stars it contains.
These types of nebulae are composed mainly of the hydrogen they obtain from nearby stars, which is their fuel.
It is using infrared light that we can "observe" and analyze in detail what happens in the inner parts of these nebulae.
Answer:
vr = 4.336 m/s
Explanation:
We are given that;
Beat frequency is 6Hz
Speed of sound = 344 m/s
Now,
Reflective Doppler frequency; f = 235 + 6 = 241 Hz
We can calculate the observed frequency if both the source sound and the observer are moving towards each other. In this case, the formula is:
f = fo[(c + vr)/(c + vs)]
Where;
ƒ = observed frequency
c = speed of sound
vs = velocity of source (negative if it’s moving toward the observer)
ƒ0 = emitted frequency of source
Since it’s moving toward the observer, thus we can rewrite equation as;
f = fo[(c + vr)/(c - vs)]
We have that;
fo = 235 , f = 241 , c = 344 , vr=vs
Thus,
241 = 235[(344+vr)/(344-vr)]
241(344 - vr)= 235(344 + vr)
82904 - 241vr = 80840 + 235vr
82904 - 80840 = 241vr + 235vr
2064 = 476 vr
vr = 2064/476
vr = 4.336 m/s
