I will mark brainlist please help 1) Which of these is not a characteristic of a wave?

A. amplitude

B. period

C. mass

D. velocity

2) if a wavelength is denoted as ‘ʎ’ then the shortest horizontal distance between a crest and a trough is equal to:

A. 3/2 ʎ

B. ʎ

C. 2 ʎ

D. 1/2 ʎ

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

Athin plate moves between two parallel, horizontal, stationary flat surfaces at a constant velocity of v = 7.5 m/s. the two stationary surfaces are spaced 4 cm apart, and the medium between them is filled with oil whose viscosity is 0.9 n·s/m2. the part of the plate immersed in oil at any given time is 2 m long and 0.5 m wide. if the plate moves through the mid-plane between the surfaces, determine the force required to maintain this motion. what would your response be if the plate was 1 cm from the bottom surface (h2) and 3 cm from the top surface (h1)? if the plate moves through the mid-plane between the surfaces, the force required to maintain the motion will be n. if the plate was 1 cm from the bottom surface (h2) and 3 cm from the top (h1) surface, the force required to maintain the motion would be n.

Infrared radiation has wavelengths that are shorter than visible light is part of the visible light spectrum has wavelengths that are longer than visible light has the same wavelengths as ultraviolet radiation