What is the difference between EMS waves and mechanical waves? Select all that apply. * Mechanical wave require a medium to travel on. EMS waves do NOT require a medium to travel on. EMS waves do NOT require a medium to travel on but, they can use a medium to travel on.

EMS waves require no material medium to travel

Explanation:

Here, we want to consider the difference between mechanical waves and EMS waves

When we talk of EMS waves, we mean electromagnetic radiation waves .

Example of EMS waves include radio waves , x-rays etc

These kind of waves require no material medium to travel and this is the main difference they have with mechanical waves

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27