Answer: 3 metres
Explanation:
The wavelength of a wave is the distance covered by the wave after one complete cycle. It is measured in metres, and represented by the symbol λ.
Recall that Velocity (V) = Frequency F x wavelength λ
In this case, wavelength (λ)= ?
Frequency of radio wave = 1.017x10^8 Hz
Velocity of radio waves = 3x10^8 m/s
Apply V = F λ
3x10^8 m/s = 1.017x10^8 Hz x λ
Make λ the subject formula
λ = (3x10^8 m/s / 1.017x10^8 Hz)
λ = 2.95 metres (To the nearest tenth, it becomes 3 metres)
Thus, the wavelength of the radio waves is 3metres
Answer:
The question was incomplete. Here is the complete question.
Explanation:
A helium-filled balloon escapes a child’s hand at sea level and 20.0C. When it reaches an altitude of 3600 m, where the temperature is 5.0∘C and the pressure only 0.68 atm, how will its volume compare to that at sea level?
The ideal gas equation:
P = absolute pressure
V = Volume of a gas
n = no of moles of a gas
R = ideal gas constant
T = Absolute temperature of a gas
For initial and final states:
= 1.4
Neutron stars are formed when a massive star runs out of gas and collapses.
Answer:
P = 17.28*10⁶ N
Explanation:
Given
L = 250 mm = 0.25 m
a = 0.54 m
b = 0.40 m
E = 95 GPa = 95*10⁹ Pa
σmax = 80 MPa = 80*10⁶ Pa
ΔL = 0.12%*L = 0.0012*0.25 m = 3*10⁻⁴ m
We get A as follows:
A = a*b = (0.54 m)*(0.40 m) = 0.216 m²
then, we apply the formula
ΔL = P*L/(A*E) ⇒ P = ΔL*A*E/L
⇒ P = (3*10⁻⁴ m)*(0.216 m²)*(95*10⁹ Pa)/(0.25 m)
⇒ P = 24624000 N = 24.624*10⁶ N
Now we can use the equation
σ = P/A
⇒ σ = (24624000 N)/(0.216 m²) = 114000000 Pa = 114 MPa > 80 MPa
So σ > σmax we use σmax
⇒ P = σmax*A = (80*10⁶ Pa)*(0.216 m²) = 17280000 N = 17.28*10⁶ N
