Answer:
20.7 volts
Explanation:
m = mass of electron = 9.1 x 10⁻³¹ kg
λ = wavelength of electron = 0.27 x 10⁻⁹ m
v = speed of electron
Using de-broglie's hypothesis
λ m v = h
(0.27 x 10⁻⁹) (9.1 x 10⁻³¹) v = 6.63 x 10⁻³⁴
v = 2.7 x 10⁶ m/s
ΔV = Potential difference through which electron is accelerated
q = charge on electron = 1.6 x 10⁻¹⁹ C
Using conservation of energy
(0.5) m v² = q ΔV
(0.5) (9.1 x 10⁻³¹) (2.7 x 10⁶)² = (1.6 x 10⁻¹⁹) ΔV
ΔV = 20.7 volts
Answer:
The correct option is: c) Sunset
Explanation:
Moon is the permanent natural satellite of the Earth. It orbits around our planet Earth and shows synchronous rotation.
When Earth is present between the Moon and Sun, the moon appears to be fully illuminated from the Earth, this is called the full moon. <u>All full moons rise about the same time as the sunset.</u>
Answer:
1.5 u
Explanation:
The range equation is:
R = u² sin(2θ) / g
When u = v, R = 2.25 R.
2.25 R = v² sin(2θ) / g
2.25 u² sin(2θ) / g = v² sin(2θ) / g
2.25 u² = v²
1.5 u = v
