Hey there! Sign in to join this conversationNew here? Join for free
    Offline

    0
    ReputationRep:
    (Original post by HasanRaza1)
    I measured the length across all three antinodes, which resulted in a length of 11.8cm. That is 0.118m wavelength
    Frequency = Speed of light in a vacuo (3x10^8)/Wavelength (0.118)
    So f = 2.5x10^9

    that's the wavelength for 2 waves isnt it?
    Offline

    4
    ReputationRep:
    (Original post by rifat12345)
    I think so, 12cm
    that'd be 2 wavelengths, so i'm sure it was 6cm?
    Offline

    0
    ReputationRep:
    Yeah I agree, I think my worst case scenario was about 50, best about 60
    Offline

    17
    ReputationRep:
    Wavelength was 59mm
    Offline

    6
    ReputationRep:
    (Original post by musslih)
    that's the wavelength for 2 waves isnt it?
    Nah, since there were three antinodes so its one complete wave they showed?
    Offline

    2
    ReputationRep:
    (Original post by musslih)
    What material did you choose for the cable for the lift and the cable/rope for bungee jumping???
    B and C

    I might be wrong I was just giving BS reasons which were popping in my mind.
    Offline

    0
    ReputationRep:
    (Original post by musslih)
    that's the wavelength for 2 waves isnt it?
    I got 0.118m
    Offline

    3
    ReputationRep:
    (Original post by Inam97)
    Your right if it was in the fundamental mode of vibration but it had 3 antinodes altogether

    Wavelengh= length between a pair of nodes times 2.

    But since there was already 2 sets of nodes it was just the whole thing = wavelengh

    Again please correct me if am wrong (didn't do that well)
    The dots where melting points, if u say it had 3 modes then how can u have melting at centre as there'd be a node at centre therefore no melting
    Offline

    2
    ReputationRep:
    (Original post by Inam97)
    I think I got 2.71 or something for the a
    Its decceleration so its -2.71

    You will probz still get full marks for it if its right god willing.
    Offline

    5
    ReputationRep:
    I always gave data to 2sf if the data in the question was to 2sf, i didnt give my answers to three sf will I be penalised?
    Offline

    4
    ReputationRep:
    (Original post by HasanRaza1)
    Nah, since there were three antinodes so its one complete wave they showed?
    yeah but the microwave started at the transmitter, not the first node? i'm all ears here
    Offline

    7
    ReputationRep:
    (Original post by Kraixo)
    Its decceleration so its -2.71

    You will probz still get full marks for it if its right god willing.
    Oh god no i did that too
    Offline

    4
    ReputationRep:
    what did you guys put for percentage change of diameter? i put 3%, but i think it was 20%
    Offline

    6
    ReputationRep:
    (Original post by musslih)
    that's the wavelength for 2 waves isnt it?
    Name:  antinodes.gif
Views: 113
Size:  5.7 KB
    Offline

    6
    ReputationRep:
    (Original post by Kraixo)
    Its decceleration so its -2.71

    You will probz still get full marks for it if its right god willing.
    The answer was 2.71 though since it asked for the deceleration
    Not -2.71
    Offline

    6
    ReputationRep:
    (Original post by 83457)
    yeah but the microwave started at the transmitter, not the first node? i'm all ears here
    Name:  antinodes.gif
Views: 103
Size:  5.7 KB
    We have 3 antinodes given to us
    One wavelength is the distance from a point on a wave, of given velocity and amplitude, to the adjacent particle on the wave with the same velocity and amplitude

    If u look at the diagram the particle motion of the wave at the antinode only reaches the same point by the 3rd antinode

    Because of this, the distance across all three antinodes gives 1 wavelength
    Offline

    2
    ReputationRep:
    (Original post by HasanRaza1)
    The answer was 2.71 though since it asked for the deceleration
    Not -2.71
    Acceleration is vector so it should be minus 2.71
    Offline

    2
    ReputationRep:
    (Original post by HasanRaza1)
    Name:  antinodes.gif
Views: 103
Size:  5.7 KB
    We have 3 antinodes given to us
    One wavelength is the distance from a point on a wave, of given velocity and amplitude, to the adjacent particle on the wave with the same velocity and amplitude

    If u look at the diagram the particle motion of the wave at the antinode only reaches the same point by the 3rd antinode

    Because of this, the distance across all three antinodes gives 1 wavelength
    so is the distance 0.12 cm or 0.24 cm
    Offline

    6
    ReputationRep:
    (Original post by Kraixo)
    Acceleration is vector so it should be minus 2.71
    In the question they specifically asked for the deceleration
    NOT the acceleration, which would be negative

    If you decelerate at a rate of -2.7m/s you are accelerating at a rate of 2.7m/s ,i.e. speeding up
    Offline

    7
    ReputationRep:
    (Original post by Kraixo)
    Acceleration is vector so it should be minus 2.71
    But it asked for deceleration, not acceleration.
 
 
 
Poll
Do you agree with the PM's proposal to cut tuition fees for some courses?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.