<u>(A). The wavelength decreases by a factor of 3</u>.
<h3>Introduction :</h3>
Hi ! We all know that all type of electromagnetic wave, will have the same velocity as the speed of light, because light is part of electromagnetic wave too. The value of it is 300,000 km/s or m/s. As a result of this constant property, <u>the shorter the wavelength, the greater the value of the electromagnetic wave frequency</u>. This relationship can also be expressed in this equation:
With the following condition :
- c = the constant of the speed of light in a vacuum ≈ m/s
- = wavelength (m)
- f = electromagnetic wave frequency (Hz)
<h3>Explanation</h3>
In this problem, we underline one concept, namely : "<u>the shorter the wavelength, the greater the value of the electromagnetic wave frequency</u>". In question, the frequency of the waveform will increase by a factor of 3 from the beginning. So, to keep this value constant, the wavelength should be reduced by a factor of 3 from the initial condition.
<h3>Proof</h3>
Assume that:
- c = c' = speed of the electromagnetic wave is always the same (constant).
- = initial wavelength =
- f = initial frequency = f
- f' = final frequency = 3f
Let we count :
- = final wavelength = ...
Step by step :
(Q.E.D)
<h3>Conclusion</h3>
So, if the frequency value is increased by a factor of 3 from its original, then the wavelength will decrease by a factor of 3 from the original.
<h3>See More</h3>
Answer:
19.5 m/s
87.8 m
Explanation:
The acceleration of block one is:
∑F = ma
-m₁gμ = m₁a
a = -gμ
a = -(9.8 m/s²) (0.22)
a = -2.16 m/s²
The velocity of block one just before the collision is:
v² = v₀² + 2aΔx
v² = (8.25 m/s)² + 2 (-2.16 m/s²) (2.3 m)
v = 7.63 m/s
Momentum is conserved, so the velocity of block two just after the collision is:
m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂
m₁u₁ = m₂v₂
(18.5 kg) (7.63 m/s) = (7.25 kg) v
v = 19.5 m/s
The acceleration of block two is also -2.16 m/s², so the distance is:
v² = v₀² + 2aΔx
(0 m/s)² = (19.5 m/s)² + 2 (-2.16 m/s²) Δx
Δx = 87.8 m
Answer:
The value is
Explanation:
From the question we are told that
The length of the solenoid is
The number of turns is
The magnetic field of the earth is
Gnerally magnetic field is mathematically represented as
=>
=>
=>
Answer:
B
Explanation:
the exact and absolute age of a rock layer
Answer:
9.8×104Nm−2,0.025,3.92×106Nm−2
Solution :
Here, L=10cm=10×10−2m
F=100kgf=100×9.8N
ΔL=0.25cm=0.25×10−2m,
Shearing stress =FL2=100×9.8(10×10−2) Sheraing strain =ΔLL=0.25×10−210×10−2 = 0.025 Shear Modulus of elasticity, G=Shearing stressShearing strain=9.8×1040.025
=3.92×106Nm−2
Explanation: