The answer is c C is the correct answer
Answer:
i) b. 14.3 Hz
ii) d. 0.4625 m/s
Explanation:
f = c / λ
f = frequency
c = speed
λ = wavelength
first question:
the given values,
λ = 2.17 m
c = 31 m/s
f = c / λ
f = 31 / 2.17
f = 14.28
∴ f = 14.3 Hz
second question:
given,
λ = 0.25 m
f = 1.85 Hz
f = c / λ
rearranging,
c = f × λ
c = 1.85 × 0.25
c = 0.4625
∴ c = 0.4625 m/s
(love your username, btw.)
Answer:
Explanation:
The change in past ice age climates can be explained by using Milankovitch cycle. According to the cycle past ice can be caused by any of the these reasons:
- Earth's orbit around the sun.
- Obliquity of the axis.
- Eccentricity of it's orbit.
- Precedence of earth's orbit.
However, today materials from past are being used such as rocks, fossil remain,etc. to study the earth's climate.
Answer:
Big Dipper, Little Dipper, Cassiopeia, Cepheus
Explanation:
In this region, the above constellations are circumpolar. This means that they appear above the horizon at all times. These are only visible all rear round for people living in Canada and Northern United States.
Circumpolar constellations are constellations that never appear below the horizon when seen from a particular location on planet Earth. Furthermore, these constellations can be seen all year while others are only seen at specific times during the year; thus they are known as seasonal constellations.
Five northern constellations are visible from most locations that are north of the equator. These are Cassiopeia, Cepheus, Draco, Ursa Major, and Ursa Minor.
Note that Ursa Major is often confused with the Big Dipper. While the Little Dipper (which is much fainter) is found in the Ursa Minor constellation. Cassiopeia can be recognized due to its W shape which is quite prominent.
