Explanation:
Metallic bonds hold metal atoms and freely moving valence electrons together, while Van der Waals forces hold nonpolar molecules together. OD. Metallic bonds hold metal atoms and freely moving valence electrons together while Van der Waals forces hold atoms together when they share valence electrons.
Answer:

Explanation:
P = Power Output = 1000 W
r = Radius = 35000000 m
= Permittivity of free space = 
c = Speed of light = 
Intensity of Electric radiation is given by

Intensity of Electric radiation is given by

The amplitude of the electric field vector is 
Answer:
The Y-axis in a Velocity/Time graph is the Velocity.
Explanation:
The speed is the velocity. Like in math, speed(velocity)=distance over time. Where time is the X-axis.
Answer: I will spread this to people! Thank you for telling me.
Answer:
See below
Explanation:
<h3>When a cold alcohol thermometer is placed in a hot liquid, the following takes place.</h3>
- The glass of thermometer expands because of the heat so the column of alcohol goes down.
- After some time, the heat travels to alcohol and then alcohol expands.
<h3><u>So, Reason why alcohol goes down first:</u></h3>
Alcohol first goes slightly down because of the expansion of the glass of thermometer before doing up.
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