Question

The tidal waves in the seas are primarily due to:
A.The gravitational effect of the Sun on the Earth
B.The gravitational effect on the moon on the Earth
C.The rotation of the Earth
D.The atmospheric effect of the Earth itself

Answer 1

The tidal waves is that wave which regularly recovers the empty water wave caused by the effects of the gravitational interactions between the Sun, Moon and the Earth on the ocean. The tidal waves specified the word tsunami.

Complete answer:
The tidal waves are formed by the gravitational force of the Earth, Sun and moon. The gravitational forces of the sun and the moon pull on the oceans causing the oceans to swell on the either side of the Earth.
Newton’s law of gravitation
$F = \dfrac{{GMm}}{{{R^2}}}$
Here, F is the gravitational Force
G is the gravitational constant
M is the mass of one object
m is the mass of the other object
R is the distance between the two objects
The gravitational force is the universal force and acts between the two objects.
The gravitational force is inversely proportional to the square of the distance of two objects.
The mass of the sun is almost $27 \times {10^6}$ times the mass of the moon. The distance between the Earth and the moon is 300000km.
The mass of the Moon is lesser than the Mass of the Sun. The distance to the Sun from the Moon is lesser than the distance to the Sun from Earth.
So, the Force of the moon is greater than the Force of the Sun.

So, the option (B) is correct.

Note:
The Sun tides also exist because of the universal force. The intensity of the Sun tides increases when it is within the range of the moon.
There are only four universal forces: Strong Nuclear Force, Weak Nuclear Force, Electromagnetic Force, and the Gravitational Force.