Answer : 96 candelas
Explanation : Luminous intensity is a quantity of light that is emitted by a light source with a solid angle in a particular direction.
We know the formula of luminous intensity
Luminous intensity = illuminance x distance from light source
So, the intensity of the source will be 96 candelas.
Answer:
mass of one atom is measured in the unit of 1 amu
Explanation:
As we know that the mass of one atom is very small and it is of order of
here we know that 1 amu is defined as 1/12 part of mass of 1 atom of C-12 isotope
so here we will have
so here we can say that mass of one atom is measured in the unit of 1 amu
The question is incomplete. The complete question is :
Two loudspeakers are placed 1.8 m apart. They play tones of equal frequency. If you stand 3.0 m in front of the speakers, and exactly between them, you hear a minimum of intensity. As you walk parallel to the plane of the speakers, staying 3.0 m away, the sound intensity increases until reaching a maximum when you are directly in front of one of the speakers. The speed of sound in the room is 340 m/s.
What is the frequency of the sound?
Solution :
Given :
The distance between the two loud speakers,
The speaker are in phase and so the path difference is zero constructive interference occurs.
At the point , the speakers are out of phase and so the path difference is
Therefore,
Thus the frequency is :
Hz
