The wavelength of the radio wave is 0.303 m.
<h3>
Wavelength</h3>
The wavelength of the wave is the distance traveled by the wave.
c = fλ
where;
- c is speed of light = 3 x 10⁷ m/s
- f is frequency
- λ is wavelength
λ = c/f
λ = (3 x 10⁷ ) / (99 x 10⁶)
λ = 0.303 m
Thus, the wavelength of the radio wave is 0.303 m.
Learn more about wavelength here: brainly.com/question/10728818
Answer:
D
Explanation:
The north field of a magnet is the positive side. Arrows pointing out of a side = positive
Answer:
The kinetic energy of the mass when the spring is stretched 5 cm is 2.55 J
Explanation:
Here we have
The mass on the spring = 0.4 kg
Spring stiffness = 200 N/m
Speed when compressed 10 cm = 3 m/s
E = 0.5·m·v² + 0.5·k·x² = 0.5·k·x²
Therefore
When x = 10 cm = 0.1 m, we have
E = 0.5·0.4·3² + 0.5·200·0.1² = 0.5·200·x² = 2.8
x² = 2.8/100 = 0.028,
x = 0.167 m
When the mass is at 5 cm we have
E = 0.5·0.4·v² + 0.5·200·0.05² = 2.8 J
Therefore, the kinetic energy = 0.5·0.4·v² = 2.8 - 0.25 = 2.55 J
The kinetic energy of the mass when the spring is stretched 5 cm = 2.55 J.
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Answer: 7.175*10^18
Explanation:
Energy of a wave:
E = nhc/λ, where
E = energy of the wave
n = no of photons
h = Planck's Constant
c = speed of light
λ = wavelength of the wave
4000 = (n * 6.63*10^-34 * 3*10^8) / (510*10^-9)
4000 = 1.989*10^-25 * n / 510*10^-9
4000 = 3.9*10^-19 * n
n = 1.025*10^22 photons per second per meter²
7.0 cm² = 7.0 / 10,000 m²
= 7 x 10⁻⁴
Photons per second = 1.025*10^22 * 7 x 10⁻⁴
= 7.175*10^18 photons per second