A.R.D Science Experts

When you look at the clock, the time is 1 pm. Between what and what time will the minute and hour hand meet each other?
a) 1:04 pm & 1:05 pm
b) 1:05 pm & 1:06 pm
c) 1:06 pm & 1:07 pm
d) 1:07 pm & 1:08 pm

Answer should be commented with logic.

What do you mean by Chandrasekhar Limit ?
Related with Astrophysics.

How can you make your own dynamic microphone? Wait for the next post.

Do you know, what are gravitons ?

Hey guys, I am back after a long long long long long.........∞ time with another scientific question!
Can you tell the full form of Laser, which is a common monochromatic electromagnetic radiation and used in many fields?

Here's something interesting to be told :

The front end of a remote control has a small light bulb. When you press a button on the remote, it sends out an infrared light signal. A detector on the TV gets these signals and tells the TV what you want it to do. Our eyes can't see this light - we can only see what's called the visible spectrum of light - red, orange, yellow, green, blue, and purple. The visible spectrum makes up just a small part of the total light spectrum.

The visible spectrum is a small part of the total light spectrum. Infrared light has a slightly longer wavelength than visible light.

The remote control system won't work if someone walks between it and the TV because the infrared signal is absorbed by the person. Similarly, it doesn't usually work if you point it away from the TV because the signal doesn't hit the detector.

Light hitting a mirror will bounce off of it at an angle equal to the angle that it hit the mirror with (see the picture below). If you hold the mirror so that you can see the TV in its reflection and then point the remote at this image, you can direct the infrared light from the remote right to the sensor on the TV.

Light is reflected from a mirror at an angle equal to the angle that it hit the mirror.

But can we see the infrared light ?

Here's a process -
1.) Switch on a digital camera or handy-cam or any other type of camera. The camera in a cell phone can be also used.
2.) Take a T.V, A.C, Set Top Box or any other device's remote. Be sure that the remote is having the light bulb at front.
3.) Position the camera, such that the view of the bulb comes in the screen.
4.) Press the any of the buttons on the remote.
5.) You will be able to see the infrared light appearing as a bluish- white light.

You can use this process to see how much properly the remotes are working.

now ?
The smallest guitar in the world is equal to the size of a Red Blood Cell ! It was made by the scientists of a university in the United States.

What will be the next number in the sequence ?
5, 7, 14, 16, 32, 34, 68, ?

What property of water prevents its temperature to rise or fall in a small time ?

How can you change Hard water to soft water or vise versa ?