What are pulses?

What is a pulse?

What is Lens ? What are types of lenses ?

What is pulse rate?

True or False .If False, give the correct statement: Cardamom and black peper are pulses.

Figure showa a string of linear mass density 1.0gcm^-1 on which a wave pulse is travelling. Find the time taken by the pulse in travelling through a distance of 50 cm on the string. Take g=10 ms^-2 .

A string of length 40 cm and weighing 10 g is attached to a spring at one end and to a fixed wall at the other end. The spring has a spring constant of 160 N m^-1 and is stretched by 1.0 cm. If a wave pulse is produced on the string near the wall, how much time will it take to reach the spring ?

What are twins ? What are their types ?

What are neurons? What are their functions.