Answer:
<em>d) Microwave ovens emit in the same frequency band as some wireless Internet devices.</em>
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Explanation:
Microwave are radio waves of short wavelength, from about 10 centimetres to one millimetre, in the Super High Frequency and the Extremely High Frequency bands. Microwaves can penetrate into materials and deposit their energy below the surface which is why is is used in microwave heating found in microwave oven. Transmission of data sometimes involves the use of microwaves to send and receive information over a long distance. Microwaves are the mainly used in radar, used for satellite communication, and wireless networking technologies such as Wi-Fi.
Answer:
<em>The cliff is 5916.75 m far</em>
Explanation:
Echo: This is a sound heard after the reflection of sound wave from a plane surface.
v = 2x/t........................... Equation 1
making x the subject of the equation above,
x = vt/2........................... Equation 2
Where v = speed of sound in air, x = distance of the cliff, t = time to produce an echo
<em>Given: t = 34.50 s,</em>
<em>Constant: v = 343 m/s</em>
<em>Substituting these values into equation 2,</em>
<em>x = 343×34.5/2</em>
<em>x = 5916.75 m.</em>
<em>Thus the cliff is 5916.75 m far</em>
Answer:
C. Mass
Explanation:
If something has the same weight than it has the same mass
Answer:
The length of the object in kilometer (km) is 70 x 10⁻⁹ km
The width of the object in kilometers (km) is 47.66 x 10⁻⁹ km
Explanation:
Given;
length of the object = 70 micrometer = 70 μm
the width of the object = 47.66 micrometer = 47.66 μm
The length of the object in meter:
70 micrometer = 70 μm = 70 x 10⁻⁶ m
The length of the object in kilometer (km):
70 x 10⁻⁶ m = 70 x 10⁻⁹ km
The width of the object in meters:
47.66 micrometer = 47.66 μm = 47.66 x 10⁻⁶ m
The width of the object in kilometers (km):
47.66 x 10⁻⁶ m = 47.66 x 10⁻⁹ km
Answer: red shifted/shorter/long/blue shifted
Explanation:
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