When a nucleus of Ra (Radium) decays, it emits an alpha particle and becomes a Rn (Radon) nucleus, as described in the (Fig. 1 – Alpha decay). In general, during alpha decay the atomic number (Z) is reduced by two units and the mass number (A), by four units.
Net force can be defined as the sum of force acting on an object in all the directions
.i.e Net force= F acting on a body at upward direction+ F at downward direction+ F at leftward direction+ F at rightward direction.
e.g if a body is at rest the sum of forces acting on body in all direction is zero
but if a body is moving its mean body is facing an unbalanced net force.
Velocity is a vector, which includes both magnitude and direction. Negative velocity means that B is travelling in an opposite direction of A.
Answer:
Explanation:
the electric field between the plates is uniform and given by
E⃗ =(120N/C) j
So electric field is along y - axis
Force on electron
F_y = 1.6 x 10⁻¹⁹ x 120
a_y ( acceleration )= ( 1.6 x 10⁻¹⁹ / 9.1 x 10⁻³¹ ) x 120
a_y = 21.1 x 10¹²
a = 21.1 x 10¹² j
time to reach x = 2 cm = 2 x 10⁻² m
t = 2 x 10⁻² / 2.5 x 10⁵
= .8 x 10⁻⁷
= 8 x 10⁻⁸ s
velocity along y axis after time 8 x 10⁻⁸ s
= u + at
= 5 x 10³ + 21.1 x 10¹² x 8 x 10⁻⁸
= 5 x 10³+ 168.8 x 10⁴
= .05 x 10⁵ + 16.88 x 10⁵
= 16.93 x 10⁵
resultant velocity
= √( 2.5 x 10⁵ )² + ( 16.93 x 10⁵)²
= 17.11 x 10⁵ m /s
Yes! with out the sun plants and animals wouldnt live right? therefore they get energey wich is passed on by food