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SSSSS [86.1K]
2 years ago
5

The speed of all electromagnetic waves is 3. 00 × 108 meters per second. What is the wavelength of an X-ray with a frequency of

1. 18 × 1018 Hz? 2. 54 × 1026 meters 3. 93 × 109 meters 2. 54 × 10-10 meters 3. 93 × 10-11 meters.
Physics
1 answer:
SSSSS [86.1K]2 years ago
4 0
Fr yyy guy guy tyy tyy
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The astronaut then measures the abundance of silicon on the new planet, obtaining the following results: Isotope Abundance. (%)M
tekilochka [14]
<span>In order to calculate an average, we should sum all numbers and divide them by quantity. Let’s work with qualifications first. Let’s say you got a 10 in 1 exam, then an 8 in 2 exams and a 4 in 2 exams. Your average will be: = (10*1+8*2+4*2) / 5 = 6.8 If 6 is the minimum, you will pass. There is another way to calculate this average: applying distributive property. = 10*1/5+8*2/5+4*2/5 = 6.8 Remember you can convert the fractions into equivalent fractions: 1/5 = 20/100; 2/5 = 40/100 = 10*20/100+8*20/100+4*20/100 = 6.8 We actually don’t have the number of atoms of each mass… we have the percentage instead! So we need to learn this last method for atoms. Let’s go back to our atoms problem: 73.71 % of atoms have a mass of 27.98 u 14.93 % of atoms have a mass of 28.98 u 11.36 % of atoms have a mass of 29.97 u So let’s put that in the formula: Average mass = 27.98 u*73.71 /100 + 28.98 u*14.93 /100 + 29.97u*11.36 /100 So what you have to know is that a percentage can be converted into a fraction, and you should work that fraction in order to find the average. We can make the calculus shorter putting 100 as the common denominator: Average mass = (27.98 u*73.71 + 28.98 u*14.93 + 29.97u*11.36)/100 So actually we are taking the percentage as if it was the quantity, and 100 as if it was the total (the total of all percentages is always 100). Maybe we don’t have 100 atoms, but it will be the same proportion anyway, whatever number we have! And here it is the result: Average mass = 28,36u </span>
5 0
3 years ago
Pls answer this ,today is last day of classes then I got finals soon lol
KIM [24]

Answer and Explanation:

The law of conversation of energy states that energy cannot be created or destroyed. The pendulum slows down and stops eventually not because the kinetic energy is destroyed, but it is transferred into sound and heat energy instead because there is air resistance and friction.

Kinetic energy => Gravitational potential energy (Loop but some energy transferring to heat and sound each time)

4 0
2 years ago
paper by itself catches fire easily whereas a piece of paper wrapped around an alluminium pipe does not.​
Julli [10]

Answer:

The paper does not catch fire when wrapped around aluminium pipe because aluminium absorbs the heat, so paper does not attain its ignition temperature.

Explanation:

7 0
2 years ago
A stone is dropped from the top of a cliff which is 10-m high. What is its velocity when it hits the ground? Sketch the stones p
kodGreya [7K]

S = displacement

V = final velocity

U = initial velocity

3 0
3 years ago
A signal is sampled at 10000 Hz and a total of 1024 data samples are taken, what are the highest and lowest frequencies that can
tia_tia [17]

Since the discrete Fourier series, the Sampling rate, would be the equivalent of the inverse of the passage of time, that is, to the frequency, mathematically this can be written as,

\frac{1}{\Delta t} = 10000Hz

In turn, the time can be described depending on the period and the amount of data samples taken. This would be,

\Delta t = \frac{T}{m}

Here,

m = Data Samples

T = Period

Replacing,

\Delta t = \frac{T}{1024}

Replacing the value of the time from the first equation,

\frac{1024}{T} = 10000

T = 102.4ms

At the same time, the range then will be given between the basic frequency to the half of the sample, that is,

f_{min} = \frac{1}{T} = 9.165Hz

f_{max} = \frac{1024}{2} (9.165Hz)

f_{max} = 5000Hz

Therefore the lowest frequency is 5000Hz and highest 9.165Hz

7 0
3 years ago
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