Find the simplified value of the following

Which property of a wave is related to its frequency?  

Rain drops acquire spherical shape due to -

A device used for converting A.C. into D.C. is called –

A parallel plate capacitor is half-filled with a dielectric slab (K = 4). What is its effective capacitance, assuming plate separation d?

If the specific heat at constant pressure Cₚ is greater than Cᵥ , the difference Cₚ -Cᵥ is equal to:

What is the telescope designed to search for earth-size planets in the nearby region of our galaxy, termed as?

The threshold wavelength for a photoelectric surface is 540 nm. Will a light of energy 2.5 eV cause photoemission?

Which device is best suited for measuring the temperature inside metallurgical furnaces?

When do spring tides occur?