The electromagnetic waves are types of waves which do not require medium for them to pass through to be able to travel from one location to another. The different types of electromagnetic waves therefore vary only in their wavelength and frequency. Thus, the answer is letter B.
Answer:
a ) 3 v
b ) 400 mA
Explanation:
In case of transformer there is relation between no of turns in primary and secondary coils and voltage input and output as follows
V₁ / V₂ = n₁ / n₂
Where V₁ and V₂ are input and output voltage and n₁ and n₂ are no of turns of primary and secondary coils.
Here V₁ = 1.5 v , V₂ = ? , n₁ = 10 , n₂ = 20
Put the values in the equation above
1.5 / V₂ = 10 / 20
V₂ = 3 v.
Similarly formula for current is as follows
I₁ / I₂ = n₂ / n₁
Whereas I₁ and I₂ are current in primary and secondary coil
Put the values in the equation above
I₁ / 200 mA = 20 / 10
I₁ = 400 mA.
Answer: C
Explanation:
when more volts are in a battery the more current you receive.
Answer:
Acceleration due to gravity is 20 
So option (E) will be correct answer
Explanation:
We have given length of the pendulum l = 2 m
Time period of the pendulum T = 2 sec
We have to find acceleration due to gravity g
We know that time period of pendulum is given by
Squaring both side
So acceleration due to gravity is 20
So option (E) will be correct answer.
I think your answer would be C. because they are replacing the trees they are cutting down.
