An automobile with a radio antenna 1.0 m long generates an emf, V1, since it is traveling at 100.0 km/h in a location where the
2 answers:
Answer:
option A
Explanation:
given,
length of antenna = 1 m
traveling at speed = 100 Km/h
Earth's horizontal magnetic field is 5.5 x 10⁻⁵ T
radio antenna doubles in length (l₂ = 2 l)
car begins traveling at a quarter of the original speed (v₂ = v/4)
ratio of new emf
we know, ε = B l v
V₁ = B₁ l₁ v₁...........(1)
V₂ = B₂ l₂ v₂...........(2)
dividing equation (2) from (1)
V₂ = 0.5 V₁
the correct answer is option A
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Answer:
The momentum of the photon is 1.707 x 10⁻²² kg.m/s
Explanation:
Given;
kinetic of electron, K.E = 100 keV = 100,000 eV = 100,000 x 1.6 x 10⁻¹⁹ J = 1.6 x 10⁻¹⁴ J
Kinetic energy is given as;
K.E = ¹/₂mv²
where;
v is speed of the electron
Therefore, the momentum of the photon is 1.707 x 10⁻²² kg.m/s