Intensity, E follows inverse square law.
E α 1/r²
r is the distance.
So if the distance r is increased by 3, the intensity would be reduced by 3²
3² = 9
So the answer is nines times as low. C.
Answer:
(X - 25)/Y
Explanation:
Change in velocity = X - 25
Time elapsed = Y
Acceleration = Change in velocity/Time = (X - 25)/Y
Answer:
A.
B.
Explanation:
The frequency has an inversely proportional relationship with the concept of wavelength, the greater the wavelength, the lower the frequency. For electromagnetic waves, the frequency is equal to the speed of light, divided by the wavelength.
A.
B.
Answer:
1. 23°
2. 65°
Explanation:
1.
The law of reflection provides that for the same medium, the angle of reflection equals the angle of incidence.
Similarly, here, angle of incidence and reflection will be 46°÷2=23°
2. Since the normal, angles of reflection and incidence lie on the same plane and also the angles of reflection and incidence are equal then the angle between the plane of the mirror and the reflected beam will be given by 90-25=65°
Answer:
A. 4.40m/s²
B. 4.615N
C. 0.7511J
Explanation:
A. Ac= V²/L
= (2.15)²/1.05
= 4.50m/s²
B. T =Mv²/L + mg
0.325(4.40)+ 0.325(9.8)
= 4.615N
C. K.E = 1/2mv²
=0.7511J
You can also refer to attached handwritten document for more details