Need asap!

which most likely a solid at room temperature?
a chlorine
b hydrogen
c neon
d potassium

a police car is parked by the side of a highway and its siren emits sound measuring 750 hz. as you approach the police car from a distance, you hear a change in the sound. the change is the sound's?
a frequency
b pitch and frequency
c frequency and wavelength
d pitch, intensity, and loudness

describe the location of non metals on the periodic table?
a middle
b upper left corner
c lower left corner
d upper right corner

displacement is to velocity as is to acceleration.
a direction
b speed
c time
d velocity

Protons and neutrons are found within the nucleus of an atom

Imagine you are riding on a yacht in the ocean and traveling at 20 mph. you then hit a golf ball at 100 mph from the deck of the yacht. you see the ball move away from you at 100mph, while a person standing on a near by beach would observe your golf ball traveling at 120 mph (20 mph + 100 mph). now imagine you are aboard the hermes spacecraft traveling at 0.1c (1/10 the speed of light) past mars and shine a laser from the front of the ship. you would see the light traveling at c (the speed of light) away from your ship. according to einstein’s special relativity, how fast will a person on mars observe the light to be traveling? a) 0.1c (1/10 the speed of light) b) c (the speed of light) c)1.1c (c+0.1c)

Awave with a frequency of 500 hz is traveling at a speed of 100 m/s. what is the wavelength?