Answer:
he correct answer is 7 3 10⁻⁹ s
Explanation:
The speed of light is constant, so we can use the uniform motion ratios
v = x / t
t = x / v
let's calculate
t = 1 / 2.9972 10⁸8
t = 3.336 10⁻⁹ s
the correct answer is 7 3 10⁻⁹ s
Answer: a.troposphere
Explanation: Most of the mass (about 75-80%) of the atmosphere is in the troposphere. Almost all weather occurs within this layer. Air is warmest at the bottom of the troposphere near ground level. Higher up it gets colder. Air pressure and the density of the air are also less at high altitudes.
Radiation and Convection transfer energy from the core to the photosphere. This is because energy from the core moves through a thick layer called the radiative zone. Also in the convection zone energy moves mainly by convection. Rising currents of hot gas in the convection zone carry energy toward the Sun's surface.
Answer:
Option (1), option (4) and option (5)
Explanation:
The main observations of Ernest Rutherford's experiment are given below:
1. most of the positively charged particles pass straight, it means there is an empty space in the atom.
2. Very few positively charged particles retraces their path.
So,
The positively charged particles were deflected because like charges repel, that means they are deflected by protons.
Almost all the positively charge concentrate in a very small part which is called nucleus.
Answer:
If there is no horizontal component to the force then it is just 0N
Explanation: