Why can we only study fish that live deep in the ocean in their home environment? What happens if we try to bring them to the surface closer to our environment?

What is hidden during a lunar eclipse? isn't the moon hidden?

Which of the following are guidelines to follow for obtaining accurate observations

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.