Answer:
d. All three statements are true.
Explanation:
In the metals the electrons are the charge carriers and they are the only mobile charges causing the flow of current when subjected to potential difference.
The electrons being negatively lead to the flow of current in opposite direction. The direction of the current is opposite to the direction of the negative charges.
Answer:
frequency = 19.56 Hz
Explanation:
given data
length L = 7 m
mass m = 7 g
mass M = 2.50 kg
distance d = 4 m
to find out
fundamental frequency
solution
we know here frequency formula is
frequency = ...........1
so here d is given = 4
and v = ..........2
tension T = Mg = 2.50 × 9.8 = 24.5 N
and μ = = = kg/m
so from equation 2
v =
v = 156.52
and from equation 1
frequency =
frequency =
frequency = 19.56 Hz
Use equation, force×distance=work done(a form of energy).
force=work done÷distance= 2240÷40=56N
Answer:
Explanation:
Let the highest and lowest score be a and b respectively .
a - b = 10
a = 10 + b
The numbers in descending order are a , 98 , 98 , b .
mean = 100 , so
4 x 100 = a + 98 + 98 + b = 10 + b + 98 + 98 + b = 206 + 2b
400 = 206 + 2b
2b = 194
b = 97
a = 107
So the scores were as follows
107 , 98 , 98 , 97
Answer:
406 nm
Explanation:
We are given;
Wavelength; λ = 775 nm
Refractive index of Calcium fluoride with wavelength of 775 nm as seen in the graph attached is approximately 1.4308.
n = 1.4308
Formula for the thickness of the film that would destruct the light is;
t = (m + 0.5)(λ/2n)
Where m is the order of the thickness.
The first smallest thickness is at m = 0 while the second smallest thickness is at m = 1.
Thus;
t = (1 + 0.5)(775/(2 × 1.4308))
t ≈ 406 nm