NASA communicates with the Space Shuttle and International Space Station using Ku-band microwave radio. Suppose NASA transmits a microwave signal to the Space Shuttle using radio waves with a frequency of 18GHz . Calculate the wavelength of these radio waves.
Answers
Answer:
λ = 0.0167 m = 16.7 mm
Explanation:
The wavelength of these radio waves can be found out by using the formula for the speed of radio waves:
v = fλ
where,
v = speed of radio waves = speed of light = 3 x 10⁸ m/s
f = frequency of radio waves = 18 GHz = 18 x 10⁹ Hz
λ = Wavelength = ?
Therefore,
3 x 10⁸ m/s = (18 x 10⁹ Hz)λ
λ = (3 x 10⁸ m/s)/(18 x 10⁹ Hz)
λ = 0.0167 m = 16.7 mm
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a student decreases the temperature of a 556 cm^3 balloon from 278 K to 231 K. Assuming constant pressure, what should the new volume of the balloon be
Critical thinking requires that
How are science and technology related?A. Technology is a branch of natural science. B. Science is a branch of technology. C. Advances in science may lead to advances in technology and vice versa. D. Science and technology are not related
certain solution has [OH-] = 4 x 10-3. Calculate the concentration of [H3O+] and the pH of the solution
B
It changes direction when it passes through an opening
С
It changes its speed and wavelength when it passes through an opening
D
It changes direction when it passes from one medium to another
E
It changes its speed and wavelength from one medium to another.
F
It changes direction when it bounces off of a solid surface.
Answers
If a sound wave refracts,It changes its speed and wavelength when it bounces off of a solid surface,It changes its speed and wavelength when it passes through an opening, and It changes direction when it passes from one medium to another. Therefore, option A, C and D are correct.
What is refraction of sound wave ?
An important case in which sound waves change form or spread out is called refraction. This phenomenon affects the bending of a sound wave owing to changes in the wave's speed.
Refraction is the reason ocean waves near a shore parallel to the beach and why glass lenses can be used to focus light waves.
If the air above the earth is warmed than that at the surface, sound will be change shape back downward toward the surface by refraction. Soundpropagates in all directions from a point source.
Thus, option A, C and D are correct.
To learn more about the refraction of sound wave, follow the link;
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Answers
The ability to be drawn into thin sheet is called malleability. The ability to be drawn into thin wires is called ductility. Copper have a high melting point due to metallic bonding.
What is metallic bonding?
Metallic bonding is a type of chemical bonding that rises from the electrostatic attractive force between conduction electrons and positively charged metal ions. Metallic bonds are more more strong than covalent bond and ionic bond
Metallic bonds is between metals and metals, have the malleable and ductile property. Elements which have metallic bonding have high melting and boiling point. Since copper is a metal, it form strong metallic bond with itself. So, copper have a high melting point.
Therefore, copper have a high melting point due to metallic bonding.
To know more about metallic bonding, here:
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Answers
Answer:
Explanation:
H⁺ = 1.2 x 10⁻²
pH = - log[H⁺]
= - log [ 1.2 x 10⁻²]
= - log1.2 + 2
= - .079 + 2
= 1.921 .
B. Jupiter
C. Mars
D. Neptune
Answers
Answer: Jupiter is believed to have prevented the asteroids in the asteroid belt from forming a planet.
Answers
Half-life is the time required for the amount of a sample to half its value.
To calculate the fraction of the sample remained unchanged, we will use the following formulas:
1.
where:
n - a number of half-lives
x - a remained fraction of a sample
2.
where:
t - total time elapsed
n - a number of half-lives
The half-life of N-16 is 7.13.
So, we know:
t = 28.8 s
We need:
n = ?
x = ?
We could first use the second equation, to calculate n:
If:
Then:
⇒
⇒
⇒ n ≈ 4
Now we can use the first equation to calculate the remained amount of the sample.
⇒
⇒
If the fraction of the sample is 1/16 = 6.25%, then the mass of the sample could be calculated as:
x g : 6.25% = 60 g : 100%
x =